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C# 7.0

C#7.0

Great Reads

IResult - A Robust Option Type for C#

by Jeremy Madden

An attempt to introduce some Functional Programming concepts into an OOP domain

Angular 7 with .NET Core 2.2 - Global Weather (Part 3)

by Fred Song (Melbourne)

Angular 7 with .NET Core 2.2 - Global Weather

New Features of C# 8

by koolprasad2003

This article will give you a brief idea about what's new in C# 7.1, 7.2, 7.3, 8.

Newt: A Powerful C# Parser Generator in a Small Package

by honey the codewitch

An LL(1) pull parser and generator that thinks it's an LL(k) parser - with a rich, simple and beautiful EBNF syntax

Latest Articles

Boilerplate Guide to Creating a Source Generator - Part 1

by Dave Elliott

A series of 6 articles to provide you with a boilerplate guide to create Source Generators.

Moq and out Parameter

by Illya Reznykov

How to mock & test methods with out parameters

ASP.NET Core: Building a Robust Authentication and Authorization System using IdentityServer

by Vikas Sharma

Build a robust authentication and authorization system using IdentityServer and ASP.NET Core 3.1

Filter Pattern with Generic Lambda Expression on WPF Data Driven Application

by Mirambek Nagashbekov

Demonstration of filter pattern along with pipeline on data driven application

All Articles

C# 7.0

How to undo this step

1 Jun 2018 by #realJSOP

0) As pointed out by Richard, part of your problem is that you need an else condition to remove the datetime. 1) The other part of your problem is that you have no way of knowing what to remove because you're not storing the datetime (that was inserted) in a variable. How can you possibly...

How do I create a label box with multiple values, and how do I make it so a vertical scroll controls it

24 Jul 2018 by #realJSOP

That's absolutely not the purpose of a label. What you actually want to use is a ComboBox.

How to show image for 10 second period then will be null after that ?

28 Mar 2019 by #realJSOP

DON'T USE TIMERS. Timer events are the lowest priority event on a Windows system. Use threading to do this. In fact, try using a BackgroundWorker objecvt to marshall image display. If that doesn't work, move to threading. If you can't manage that, try the React framework (google is your friend).

How can I insert an array of a table column into a column of another table?

4 Apr 2019 by #realJSOP

Instead of trying to "find it on the forum and on the internet", try taking notes in class, and then referring back to them when it's time to do your homework.

C# - how to get message from explorer via process.start

4 Apr 2019 by #realJSOP

You can use HTTPWebRequest and HTTPWebResponse to do this without running IE. The web response will contain the error. How to: Request data by using the WebRequest class | Microsoft Docs[^]

How do I load a DLL into a custom created app domain

10 Jun 2019 by #realJSOP

It sounds like you're tryitg to perform "live" updates without having to stop the service and restart. 0) One alternative is to have the service monitor the install folder for changes to referenced DLLs, and have it restart itself when it detects a change.This would eliminate the need to load...

How do I immediately return a result from a task

1 Oct 2019 by #realJSOP

You can just return String.Empty without doing the await. Of course, that would make the method synchronous (because there's no await statement), but I don't see that as a bad thing if it's merely a default implementation.

Compilation problems and more

2 Dec 2019 by #realJSOP

Have you tried recreating your web app from scratch to see if it's just some sort of weirdness in the solution? That often fixes these kinds of problems for me.

After removing update panel from ASP page I am getting this error "cannot unregister updatepanel with ID "

20 Sep 2017 by $ultaNn

I am getting this error after i remove update panel from the page . Cannot unregister UpdatePanel with ID 'UpdatePanel1' since it was not registered with the ScriptManager. This might occur if the UpdatePanel was removed from the control tree and later added again, which is not supported....

Sql transaction in using code

3 Jan 2018 by $ultaNn

how can i use transaction code in below code for multiple query private SqlConnection DBCon { get { return new SqlConnection(ConfigurationManager.ConnectionStrings[" "].ConnectionString); } } protected DataTable ExecuteQry(string Qry) { DataTable dt = new...

Error while using nextresult fuction with datareader

12 Aug 2018 by $ultaNn

Error while using NextResult fuction with datareader cannot get second table result and error on second NextResult line " invalid attempt to call nextresult when reader is closed " using (SqlConnection myCon = DBCon) { try { string Qry = @"SELECT...

Return function int64 C++ to a C# project

10 Nov 2018 by 11917640 Member

Int64 localp = RerturnLocalPlayer();

C# generic static field problem

12 Sep 2018 by 855

public class base{ public string f1; } public class Derive1{ } public class Derive2{ } void fun1() where T: base { T t = new T(); string f = t.f1; } above code works well. let change the f1 to a static field. What I have tried: public class base{ public static string f1; } ...

Dynamic dependency injection in ASP.NET core MVC

24 Sep 2018 by 855

In my app, there is one interface and two subclasses. Two subclasses have been registered as services. My question is how to control which one to get when i use them? //HomeController.cs public class HomeController : Controller { public interface ITestDI { } ...

Add text on an image

29 Sep 2018 by 855

I have an image like 1.png, in the image there are two fields on it. like below: Name: Date: i have an app to receive the name and date from user, then put the values on the image Name: John Date: 2018-10-01 and save it as john.png. how to implement this using C#? Thank you! What I have...

Static property issue

18 Nov 2023 by 855

i found a solution of this: public abstract class A { public static string f { get; set; } } public class B : A { public new static string f { get; set; } static B() { f = "B"; } } public class C : A { public...

Static property issue

21 Sep 2018 by 855

public abstract class A { public static string f { get; set; } } public class B : A { static B() { f = "B"; } } public class C : A { static C() { f = "C"; } } What I have tried: C c...

Why this change language in multilingual need twice click ?

23 Dec 2018 by @Sai_Y

Hi ! I try to create a multilingual project in C# 2013 windows application by following this link, but when I click on the button to change language for the first time and the system need to restart; it still keep this same language or not change yet. I need to repeat it again and then the...

Incorrect syntax near the keyword 'ORDER'

8 May 2017 by _Asif_

Your query is wrong. cmd = "SELECT DISTINCT(seckeyword) FROM INA_Keyword WHERE shortcode = "+ Shortcode + " AND keyword = " + keyword + " ORDER BY seckeyword"; It should be like this cmd = "SELECT DISTINCT(seckeyword) FROM INA_Keyword WHERE shortcode = '"+ Shortcode + "' AND keyword = '" +...

How to call the day of week for any date in C#

1 Mar 2022 by _Asif_

This should give you a hint if I have understood your issue correctly. if (vid.Columns[index].HeaderText == ds.Tables[0].Rows[j]["Day"].ToString()) { DateTime _tmp = dr["Day"] // assuming the object is DateTime. e.Item.Cells[index].Text = ...

Multiple files from 2 or more file upload controls

2 Nov 2018 by _ProgProg_

Dears, I 've a situation here in uploading multiple files from multiple controls in asp.net mvc. How can i differentiate (grouping) between files of each file upload controls? In HTML: Here is the uploaders:

How do I use captcha in angular 8 with back-end (dot-net core 3.1) verification?

31 May 2020 by _ProgProg_

I want to implement captcha verification in angular 8 with back-end verification in dot-net core api v3.1 What I have tried: i tried using BotDetect...

Microsoft.data.sqlclient.sqlexception: 'incorrect syntax near '/'.'

7 Jul 2023 by A Belal

I want to create invoice Error Is An unhandled exception occurred while processing the request. SqlException: Incorrect syntax near '/'. Microsoft.Data.SqlClient.SqlConnection.OnError(SqlException exception, bool breakConnection, Action...

stored-procedure

Select list is null. Why?

12 Sep 2023 by A Belal

Error An unhandled exception occurred while processing the request. ArgumentNullException: Value cannot be null. (Parameter 'items') Microsoft.AspNetCore.Mvc.Rendering.MultiSelectList..ctor(IEnumerable items, string dataValueField, string...

When click edit the problem is add instead of edit

5 Nov 2023 by A Belal

I have a controller named Categories. I have one form or One View for Create And Edit. Create Action works well, but when I click Edit, the NewRow is added in database. The problem is I want to Edit Row without adding new in database. What I...

System.nullreferenceexception in repository pattern

18 Dec 2023 by A Belal

in Repository Pattern System.NullReferenceException Delete Method System.NullReferenceException HResult=0x80004003 Message=Object reference not set to an instance of an object. Source=Microsoft.EntityFrameworkCore StackTrace: at...

entity-framework

How does the below loop break?

4 Mar 2020 by A. J. Bozdar

Could you please tell me how second loop or the if statement breaks here? int outer; int inner; for (outer = 2; outer

Prevent SQL injection while accepting user input.

10 Feb 2021 by aakar

Hi, I have a legacy web application which accepts user input from textboxes. In one of the screens where user can add new records to the database, need to prevent SQL injection by making not much changes to existing code. Existing code is as...

SQL-Server-2008R2

I need an explanation for a code from Microsoft documetion ?

16 Dec 2019 by Abdalla Ben Omran

sice the code is working very well but i can't understand the code . i have tried to read it and understand it but it's not a clear for me . i have used this code because i wanted to decompress some files that i have downloded it on my local drive . i will be very happy if someone could...

Create C compiler using C# and visual studio 2017

25 Nov 2017 by abdou_31

How can i write a program using C# and visual studio 2017 that compile a code source writing on C programming, How can i do that? any simple solution to write this program? if not , so how can i use flex and bison for that program ? If C# didn't do this job, what is the perfect language that i...

How to get the list of pinned applications in taskbar using C#

23 May 2017 by abdul subhan mohammed

Dear All, I'm creating a windows application in c#, where automating windows. And I'm trying retrieve all/list of the pinned applications in the taskbar. What I have tried: I searched on internet, but I didn't get any suitable solution. Can anyone please help me. Thanks in advance.

Error while trying to read XML from URL in ASP.NET core 2.1

23 Jul 2018 by Abhi1 Kanobi

I am trying to read a XML file from a URL and below is my code in .net core var url = "https://some.com/feeds/newfile.xml"; var httpClient = new HttpClient(); var result = httpClient.GetAsync(url).Result; var stream =...

How to loop through all ribboncontrol barbuttunitems inside windows form

17 May 2019 by Abuamer

i want to loop through my win form Application to set my security roles on it. i have aribboncontrol1 which has six barbuttunItems .(barbuttunSave,barButtunEdit,barButtunDelete,barButtunNew,barButtunPrint,barButtunExit) i want to make only barbuttunSave and barButtunPrint active(enabled=true)...

SQL-Server-2014

Insert data into databse code first

8 Oct 2019 by Abuamer

Iam New In Entity-framework...i created Windows Apllication in visual studio 2019 iam using Entity-framework 6.i created DatabaseContext like that using LedgerGroup.TheLedger.Core.Entities; using System; using System.Collections.Generic; using System.Data.Entity; using System.Linq; using...

How to make recursive cte SQL with 3 hierarchy levels ?

28 Dec 2019 by Abuamer

i have a table inside my sql server Express 2014 called ChartOfAccountsTree. what i want to call my accounts inside that table with hierarchy view . first of all i have MainTree ... then inside it there is assets . then inside assets there is lands. what i want to do is to call thes accounts...

How do I generate transactionnumber from SQL server EF

1 Mar 2021 by Abuamer

i created desktop application in accounting Field using c# and SQL Server 2014 . i have more than 36 users using my program at the same time . i already hosted my database at smarterAsp.net . my program Consists of 7 modules(Fixed Assets-...

SQL-Server-2014

How do I use async and await in winform app

25 Nov 2021 by Abuamer

i have created windows form application with c# and sql server 2019 i have atable inside my sql server database named InevtoryCode i want to update my table with async and await . the problem is my code already run but i think thats is not the...

entity-framework

How do I make navmenue resposive

9 Jan 2022 by Abuamer

i am making a web application with Blazer and i used radzen Sidebar instead of defulat sidebar but the problem is that i my navmenue is not resposive.is that any way to fix this problem. and that is my code What I have tried: that is the code...

I would very much like to know how to continue after compiling my c#.net program code in order to create an executable file for installation. Thanks

23 Jul 2020 by abuhmamm

i would very much like to know how to continue after compiling my C#.net program code in order to create an executable file for installation. thanks What I have tried: i would very much like to know how to continue after compiling my C++...

How to run cellendedit when a cell value changes in the datagridview

18 Dec 2020 by Adilcan Topuz

The CellEndEdit event is running when I edit the datagridview cells. but when I print the data from the database to the DataGridView cell, CellEndEdit does not work. dataGridView1.Rows[0].Cells[0].Value = "test"; How can I run CellEndEdit? THANKS... Codes: private void btnKaydet_Click(object...

How to insert and update checkbox values in ASP.NET MVC?

13 Jul 2017 by aditya2314

Hello All, I am performing CRUD operation in MVC. I am stuck with checkbox. I am simple using html checkbox controls. For database connectivity i am using Entityframework technology. Reading ...

Which ASP.NET MVC template to use?

6 Jun 2017 by Adityakumar2318

Hello All, I have a html responsive template. I want to use that template with Asp.NetMVC5. Now i have two option to use that template. 1) With empty MVC Template(I would not get any folder) 2) With ready made MVC Template (After choosing this, i will get Model folder, View Folder and...

How to log the error in database using log4net in ASP.NET core 2.0

18 Aug 2018 by Adityakumar2318

I am trying to log the error in database using log4Net in Asp.Net Core 2.0 but it seems that log4Net is not fully supportable till now. I have checked it on official site(log4net[^]) too. What I have tried: Log4net for .Net Core 2.0 – Rizk Hanna[^] I have tried above link and its writing the...

Visual studio (2019) how change font windows search ?

30 Jan 2021 by aereosim

the CRTL+F search window has a small font that I can't change What I have tried: options environment font and color in the menu search results window I changed font size from 9 to 12, but it has no effect

Experimenting with C# 7’s New Features

21 May 2017 by Afzaal Ahmad Zeeshan

This post talks about the most important improvements to the C# language in its 7th version, provides some IL overview, as well as my own personal opinions on the features and improvements.

How to INSERT to SQL table integer datatype- column ?

30 May 2017 by Afzaal Ahmad Zeeshan

Perhaps, your string cannot be converted to integer. What string are you passing? Since you are using the value of a textbox, it is likely to contain some non-numeric characters there, even a space can cause issues. Also, change, int val2 = 0; val2 = 1 * ... To the following, int val2...

Mission Impossible: Migrating .NET Core 1.x to 2.0

19 Aug 2017 by Afzaal Ahmad Zeeshan

.NET Core 2.0 brings a lot of improvements to the system, and it brings a lot of pain to the developers as well. I had a lot of problems upgrading .NET Core 1.x apps to .NET Core 2.0; I yet have to feel the promise it makes about performance and so, but let us see how to upgrade our existing applica

entity-framework

Android TCP client and visual studio C# server

23 Oct 2017 by Afzaal Ahmad Zeeshan

This is a question that we get most often, in this category. For example, have a look at the answer that I provided a few weeks ago: Android TCP client and C# visual studio server how to do it.[^]. The thing is you need to understand that Android as well as .NET framework, both support TCP...

How to download files from Google drive and save to a folder on local using C#

20 Feb 2018 by Afzaal Ahmad Zeeshan

That is because the file itself is corrupt, as it is not a .doc file rather an HTML document to sign in to Google that has been downloaded as the file you wanted to download. What you need to do is, check whether Google is authenticating your request or not. You did not include the code to...

How use pointer in C# like C++

7 Nov 2018 by Afzaal Ahmad Zeeshan

If you want to use C# because, then you have to leave all that pointer luxury with the C++. The core concept of C# was to enable you to have a managed environment, where you only had to write the business logic instead of having to manage the low-level memory and hardware as well. C# itself is...

Not able to post from MVC controller to web api

22 Feb 2019 by Afzaal Ahmad Zeeshan

Your question itself has the answer, your task has not yet been evaluated—Result = "{Not yet computed}. You need to give it more time, and check the result later. This time won't be known to you, since it is undefined amount of time. That is because in the synchronous code you need to wait for...

How to implement ADFS with existing ASP.NET core 2.0 MVC

18 Jun 2019 by Afzaal Ahmad Zeeshan

You need to check how WSFed is supported in .NET Core, see this link to understand how things have changed, ASP.NET MVC Core Authentication against On-Perm ADFS · Issue #1920 · aspnet/AspNetCore · GitHub[^].

How to validate email id exist or not using c#.net

22 Jun 2019 by Afzaal Ahmad Zeeshan

Please study how SMTP protocol works and how different SMTP service providers function. They do not allow, or sometimes they hide away the fact whether an account exists or not. I once worked on a project where we had to accept and receive the emails for every recipient email address (yes,...

How and where do I implement "create a directory named data in your project to save your data set files." in this program

30 Jul 2019 by Afzaal Ahmad Zeeshan

Quote: what on earth is a directory and how do I implement it , where do I implement it A folder. :facepalm: What they are saying is that you need to create a folder (directory) called "data" and store the data files (on which you will be training models) in that folder (directory). Oh, and...

How can I make this program loop and save a line of text into a text file in C#?

1 Aug 2019 by Afzaal Ahmad Zeeshan

Quote: but it needs a lot more training That is machine learning 101 for you right there. Quote: I would literally just ask the user if the prediction was correct This does work, and will work just fine. In most production environment this is not ideal scenario as it can lead to so many serious...

Does the code used at the same time affect the operation

27 Aug 2019 by Afzaal Ahmad Zeeshan

Quote: if the javascript code that I use on the view side uses different users at the same time, is there any problem? On the same machine? Like as in fighting to execute the JavaScript code, then yes there would be problem. Just kidding: No, the client-side code remains on the users' machines...

How do I creating service-based database in VS with arabic collation?

7 Nov 2019 by Afzaal Ahmad Zeeshan

Quote: if any Arabic data inserted or updated to table it show as ???? (using linq to sql) Do you use Unicode while storing the data in the database? If so, make sure that your columns also support Unicode data—or specify Arabic collation. The reason behind "???" in the data is that by the time...

entity-framework

Dropdownlist always return the first item

23 Oct 2019 by ahmadisetup

put your dropdown list in this code if (!IsPostBack) { do something }

How to create TCP viewer on label?

30 Dec 2018 by Ahmed Adel

How to create TCP viewer only ms , and make it dll to run with my program to view only TCP ms , thanks a lot What I have tried: i tried to create label to show TCP viewer ms but i can`t create dll to hook on my online game

Error shell in C# 2017

31 Dec 2018 by Ahmed Adel

i create button on c# 2017 to run my application.exe and that code : Shell(Application.StartupPath & "\HTLauncher.exe -1") Error : the name 'shell' does not exist in the current context c# and its work on c# 2010 what can i do ... please help What I have tried: ...

How do I add ip at windows firewall from table SQL

8 Nov 2020 by Ahmed Adel

hi guys , i already make program at C# got public ip and added in table name IP that client side , i want to create other one for server side take those IP from sql table and add this ip in windows firewall to allow them , i already test with CMD...

Where can I found an example that explain using prism 6 library with entity framework

3 Sep 2017 by Ahmed Dabas

Where can i found an example that explain using Prism 6 library with entity framework in wpf applications by implementing MVVM Framework What I have tried: i google it , and no result founded

entity-framework

How can I implement using unit of work pattern with entity framework in WPF

30 Dec 2017 by Ahmed Dabas

Hi , i want an example discussing Using Unit of Work Pattern with Entity Framework in Wpf , i realy deal with repository pattern without unit of work so this make me confused please some help What I have tried: i googled it , but all examples talk about ASP.Net MVC

entity-framework

How to iterate in a datagrid to get rows and columns in WPF ?

1 Jan 2018 by Ahmed Dabas

I have a DataGrid with two columns , one theme is checkbox column and the other is text column . I want to iterate through DataGrid Rows and check if CheckBox Cell was Checked , then add this row to list of employee it's in winforms all to do that: foreach(var r in DataGridRows) { ...

When I insert multi-records I face identity_cash proplem

1 Jan 2018 by Ahmed Dabas

I try to insert multi-records in foreach loop using Entity Framework , first record inserted successfuly , but whet start insert second record an sql exception occured it details say (SqlException: Cannot insert explicit value for identity column in table 'EmployeeVacation' when IDENTITY_INSERT...

entity-framework

Error when update database usin EF core

14 Jan 2018 by Ahmed Dabas

I add a new migration to my solution , and when trying to update database using this command (Update-Database) , there is an error message shown 'There is already an object named 'Currency' in the database. ', i'm using entity framework core 2.0 What I have tried: Add-Migration NewMigration...

entity-framework

How can I populate hierarchical treeview or datagrid

13 Jul 2018 by Ahmed Dabas

I want to populate treeview and datagrid from accounts table hierarchically using code behind not mvvm and call data using Entity Framework ,the table shown in the attachments https://ibb.co/gMvSj8 What I have tried: i don't know how can i do that

entity-framework

How can I let create and view list of details in the same view

29 Aug 2018 by Ahmed Dabas

I study asp.net core , and i wnat to view create form and list of details in the same view page For Example: if i have two tables (Department - Employee) , in the department Index view when i click details button the controller will redirect to details view , i want the update details view to be...

How do I display a progress bar while loading a datatable from database

27 Dec 2018 by Ahmed Dabas

How can display a progress bar while data is loading from database using Entity Framework? What I have tried: i try to using Backgroungworker but failed :(

entity-framework

Entityfreamework core 2 slow in first query

16 Feb 2019 by Ahmed Dabas

I'm working on an desktop app using (wpf , EF Core) and i note that response little bit slow in first query when application run first time , then every thing ok what is the cause of this problem? and how can i handel it ? What I have tried: i can't solve it , the problem still

EF core repository cannot update record with string key

22 Feb 2019 by Ahmed Dabas

I'm using repository pattern with ef core 2.2 , whet i try to update record with string PK , method Find(Key) cannot find the record. but when i change the PK to identity INT method work !!! What I have tried: Imgur: The magic of the Internet[^] Imgur: The magic of the Internet[^]

entity-framework

Saving data not working with autofac

1 Feb 2020 by Ahmed Dabas

Hi ... i'm working on wpf app (without Mvvm Pattern) using Generic Repository and Unit Of Work and Autofac the problem that i face, when i save data to database , nothing happen (not saving) i try alot of things and nothing working the file uploded at this link TimCoAutoFac[^] What I have...

Grouping data using entity framework

13 Mar 2020 by Ahmed Dabas

I have table contain some fields like (EmployeeId + OperationId + Operation_Amount) I want to get the summation of Operation_Amount for every operation to every employee Result will be as (EmployeeId + OperationId + Sum_Of_Operation_Amount) I...

entity-framework

What is the best pattern can I use with EF core?

19 Nov 2020 by Ahmed Dabas

I'm working with Repository pattern in my desktop project's , but i faced some problems with this pattern earlier i read many articles discuss that this pattern is dead so , i tried to find what's the alternative ? what is the suitable pattern...

How can I send validation message from DLL library

5 Dec 2020 by Ahmed Dabas

I've Desktop application with N-Tire architecture , i want to send validation message from business layer to GUI Form to show it in MessageBox to make code more reusable and isolated. how can i achieve this What I have tried: i try throw new...

How to make recursive cte SQL with 3 hierarchy levels ?

28 Dec 2019 by Ahmed Elbaz

Based on the table definition and data you provided I recommend to create a function to return the fully qualified name (full name) of each account as follows: CREATE FUNCTION [dbo].[GetAccountFullName](@AccountId INT) RETURNS NVARCHAR(MAX) AS BEGIN DECLARE @AccountFullName NVARCHAR(MAX); ...

How to deserialize json object into list of customers C#

19 Oct 2022 by Ahmed Elbaz

Just change the return type to List as follows: public static async Task> GetTempData()

How can I fix the array?

26 Oct 2022 by Ahmed Salah Oct2022

namespace program { class program { static void Main(string[] args) { int[] grade = new int[10]; int[] cre = new int[10]; string[] gpa = new string[10]; double[] gs = new...

When check in in tfs file it not included on project on source control

18 Dec 2018 by ahmed_sa

Problem When check in in tfs file it not included on project on source control ? i worked on tfs and there are 10 person connected when i make check in to file from my computer it not show on another computer when another users make get latest version this file i do check in to it not show...

When try to show image on print document it display as system.byte[]

31 Jan 2019 by ahmed_sa

Problem When try to display image from datatable and display image on print document it show as system.byte[] in case of image exist on datatable ? public DataTable GetChecked() { DataTable table = new DataTable(); table.Columns.Add("MemberCode",...

Ambiguous error happen when build project on visual studio 2015 ?

24 Feb 2019 by ahmed_sa

Problem ambiguous error happen when build project on visual studio 2015 ? error : Combined length of user strings used by the program exceeds allowed limit.. How to solve this error please ? my project big and have more files and cannot know on which place this problem come problem...

How to execute function below every 10 second by timer ?

27 Mar 2019 by ahmed_sa

Problem I need to execute function retrieve image every 10 second by using timer control i already put timer control on windows form but how to run and execute this function in timer every 10 second . meaning i need every 10 second refresh and executing function below I work on windows...

multi-threading

How to show image for 10 second period then will be null after that ?

28 Mar 2019 by ahmed_sa

problem How to show image for 10 second period then will be null After that ? I have TimerCount on windows form get last image on table members every second and this is work success using windows form timer on visual studio 2017 . and I need when new image retrieved show this image for 10...

How to pull only new data from zkemkeeper by registering the real time events?

3 Apr 2019 by ahmed_sa

I need when any record attendance done on machine zk can get that record directly ? i search more on internet i found one way is called register real time event as below How to use sta_RegRealTime to pull data automatically my link...

How to write for loop increase from hour by duration for every iteration ?

6 May 2019 by ahmed_sa

Problem How to write for loop increase from hour by Duration for every iteration ? I work on windows form application csharp vs2015 i have three textboxes txt_fromhour 6 txt_tohour 12 txt_Duration 1.5 txt_countduration 4 (calculated as 12-6=6/1.5=4) I have table name training have...

How to convert user class object to json file when success login ?

30 Aug 2019 by ahmed_sa

How to convert User class object to json file when success login ? I need to convert user class object to json file represent status of login and data related as following ; this is actually desired result { "request_status" : { "status" : "succeeded", "code": 0, "message" : "login...

How to generate access token by using jwt ?

15 Sep 2019 by ahmed_sa

I work on asp.net core 2.2 application and i need to generate access token by using jwt i dont know how to generate i search more on internet but not understand what this mean i need actually when make success login generate access token but i dont know what this term made and how to generate ?...

How to do count login attempt within period ?

1 Sep 2019 by ahmed_sa

I work on web api login functionality and i need to make count login attempt within period How to do it . are that will made on separate action or what What I have tried: public class Users { public string UserName { get; set; } public string Password { get; set; } ...

How to pass value from action to action on web api ASP.NET core 2.2 ?

6 Sep 2019 by ahmed_sa

How to pass value from action to action on web api asp.net core 2.2 ? i return data from action and i need to user this data returned on another action so that what i make to do that please ? i need to get access token string value returned from action and reuse it inside another action to...

What link must generated if I do post url action ?

6 Sep 2019 by ahmed_sa

what link must generated if I do post url action ? suppose i have action result as below : public class Users { public string UserName { get; set; } public string Password { get; set; } } public const string SecurityLogin = "Security"; public static class Login...

Error 404 failed to load resources file when connect from post man to my app .NET core 2.2 sending post request

6 Sep 2019 by ahmed_sa

Problem I have error 404 couldn't load resources when using post man to send post request to authunticationcontroller/PostUserLogin I spend more time but in last not worked or not hit breakpoints on action PostUserLogin . i move action PostUserLogin to controler MenuController and send post...

How to add userid to payload when generate access token using JWT ASP.NET core 2.2 ?

6 Sep 2019 by ahmed_sa

problem How to add UserId to payload when generate access Token Using JWT asp.net core 2.2 ? i make function generate access token but i need to modify it to have or load userid on payload and get result as json ? how to do that if possible ? I need if string userid paramters have values add...

How to display object name as start when serialize object using dynamic ?

6 Sep 2019 by ahmed_sa

problem: How to display object name as start when serialize object using dynamic ? object name not display as start of json why ? generated json I need is: request_status : { "status" : "failed", "code": 1, "message" : "login failed, incorrect username or password" } What I have tried:...

How to return access token as json result ?

7 Sep 2019 by ahmed_sa

Problem How to return Access Token as json result ? I work on asp.net core 2.2 from function below i generate access token it is success generated as string but i need to generated as json How to generate access token as json from function below ? What I have tried: public string...

How to convert result of jwt to json from function generatetokens ?

7 Sep 2019 by ahmed_sa

I have function return string as Encoded access token How to return Jwt as jsonresult before encoding from function GenerateTokens(); and put result in user.AccessToken as json meaning i need to assign jwt variables before converted by JwtSecurityTokenHandler().WriteToken as json and...

How to get value of id as admin on json below ?

11 Sep 2019 by ahmed_sa

result of jsonToken = {{"alg":"none","typ":"JWT"}.{"user":{"id":"Admin"}}} this line of code exist below var user = jsonToken.Claims.First(claim => claim.Type == "user").Value; return {"id":"admin"} i need to get value of id meaning i need to return Admin You could convert user string to...

Why result not changed on browser when custom middle ware loaded for first time ?

17 Sep 2019 by ahmed_sa

problem why result not changed on browser invoke method custom middle ware after loaded for first time ? 1 - I put breakpoints on invoke method on custom middle ware and run visual studio on run time first time . 2 - after load it hit function invoke then it check variable AccessTokenValue it...

How can I generate string json format for my case ?

20 Sep 2019 by ahmed_sa

I need to make json string formate suitable to select statement as following : select FooterTable.LineNumber,FooterTable.ItemCode,FooterTable.Quantity,FooterTable.UniPrice,FooterTable.Total from MasterTable inner join FooterTable on...

How to modify getselectstatement to get inner join select statement ?

21 Sep 2019 by ahmed_sa

How to modify GetSelectStatement to get inner join select statement ? as below : select FooterTable.ItemCode,FooterTable.Quantity,FooterTable.UniPrice from MasterTable inner join FooterTable on...