ASP.NET Core

Prevent multiple tabs

13 Jun 2019 by #realJSOP

"prevent multiple tabs in browser of a given web site" - Google Search[^]

Asp.net core 2.2 javascript changes not being picked up

2 Jul 2019 by #realJSOP

Clear your cached data. Happens all the time, in all browsers.

How to access usb device using ASP.NET core

6 Apr 2020 by #realJSOP

If your device isn't a HID (human interface device), you won't be able to access it. If it *is* a HID, there are ways to do it. Google "usb hid from web site". You'll get thousands of results.

ASP

How to delete file by C# with timer

22 Jun 2020 by #realJSOP

I've been writing code for over 40 years, so do with this as you see fit... If it were me, I'd write a windows service that lives on the web server to do this. Of course, if it were me, I'd put log entries into a database (instead of cluttering...

Load 2 GB XML file to SQL server using sqlbulkcopy

14 Jul 2020 by #realJSOP

Try reducing the BatchSize to 1000 (500,000) seems way to high to be efficient). It will be obvious within a second or two if it's going to work. by simply monitoring the row count in the target table. Another option is to read a certain...

XML

Error in "which was not supplied" when post data using ajax .NET core MVC

10 Aug 2021 by #realJSOP

We can't fix your code. You have to develop some form of debugging ability. Use the developer console in the browser to find out what's happening. You'll probably have to add console.log() statements to your javascript at key points to help you...

MVC6

Auto-incrementing a project number in ASP.NET core app

5 Dec 2021 by #realJSOP

0) You don't need to store the "full project number" string. You can build it when you query the database to retrieve the desired data. 1) You shouldn't create a new project in the database unless certain minimal criteria have been met. This...

C# linq dynamic query - display values using column index

20 Dec 2021 by #realJSOP

Use reflection. I change the object names a bit and refactored the sample list, but you'll get the picture. public class InboundDataItem { public string OriginCompany { get; set; } public string OriginState { get; set; } public...

Linux

Sending reminder e-mails at a given time every week in .NET

22 Dec 2021 by #realJSOP

Don't do it in .Net - let the database do it. Setup a job that sends the reminders every day at a specific time. Keep in mind that you'll probably need to setup a no-reply email account in order to use an SMTP server. Don't forget to give the...

How to pass record from table to partial view

7 Feb 2022 by #realJSOP

There's at least one article here n CP that describes some methods for doing this: Different Ways to Pass Data to Partial View[^]

Javascript

DataTable

Interacting with outlook from an ASP.NET core blazor web-site

30 Mar 2022 by #realJSOP

Why can't you simply present a TextArea that allows the user to review/edit, along with a Send button that does the mechanical stuff (using mailto). BTW, you can add attachments with mailto - How to use mailto: links to send attachments? :...

Blazor

Outlook

Sending email in .NET core web api with attachments

20 Apr 2021 by .NET- India

Hi, I am able to send email in asp.net core web api with attachments but attachments exists locally in a folder of api application. But i want to send attachment dynamically i.e. ...

How do I implement permanently disabled (lockout) feature, so that user can't log in, in ASP.NET core 2 identity

WebAPI

5 Nov 2018 by 1suli0

Well, after a few hours of googling, I still can't find an answer, not even partial one. Is this even possible, or it must be custom solution? What I have tried: I've played around with locked out feature of Identity, but it seems, that is not the answer, because in that scenario user is...

authorization

authentication

How to get namespace using microsoft.aspnetcore.hosting.internal;

15 Nov 2022 by 2011999

I am installing in my system ASP Netcore 3.1 but unable to get this name space netcoreapp3.1 What I have tried: but show in intelligence in this namespace using Microsoft.Extensions.Hosting.Internal; ...

ASP

When I am click payroll. New pay, payment records of sub menu not toggle..

23 Nov 2022 by 2011999

Payroll is Main Menu. and New Pay and Payment records of Sub menus. Payroll New Pay Payment Records When i am Click Payroll. not show the submenu's How can i get the Payroll of the submenus. What I have tried: ...

When I am click payroll. New pay, payment records of sub menu not toggle..

23 Nov 2022 by 2011999

Employee ...

Asp.net core identity 2.2 question

29 May 2019 by 855

Create ASP.NET Core 2.2 Web Application(MVC) with Individual User Accounts. In the _LoginPartial.cshtml file, there are something like this: But there is no AccountController,the project only...

Azure signalr service question

29 May 2019 by 855

I created a signalr service on Azure. I'm trying to connect it from C# client. Below is the code sample i found, something i don't understand is when Azure SignalR already used(app.UseAzureSignalR), why map it to a local Hub(Chat)? will the Chat.cs be hosted on azure? startup.cs...

Integrating ASP.Net Core 2.0 and Angular 4 projects using CLI and Visual Studio Code - Beginners Tutorial

Azure

SignalR

16 Sep 2017 by @sof-mckoy

Step-by-step tutorial on integrating projects created using angular-cli and dotnet-cli

angular-cli

dotnet-cli

How can I search only checked items from database [ASP.NET]

19 Jan 2022 by _Asif_

Its not that difficult. Approach could be like * HashMap filterMaps = new HashMap() * for each column (Id, Age, sex, group, etc) filterMap["Id"] = 001 filterMap["Age"] = 12 * ArrayList list = new...

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...

Paid and remain amount always saved null in database

10 Jul 2023 by A Belal

paid and remain Amount always saved null in database although i get value is not null by javascript What I have tried: my storedProcedure USE [OnlineMarket] GO /****** Object: StoredProcedure [dbo].[InsertintoSalesInvoice] Script Date:...

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...

C#7.0

MVC

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...

I have a problem in calling web api using jquery

12 Nov 2023 by A Belal

I have a problem in Calling Web Api using jquery when calling Web Api using jquery and open Console from browser Error is jquery-3.3.1.min.js:2 Uncaught TypeError: (h.dataType || "*").toLowerCase is not a function at Function.ajax...

I have problem with JWT

20 Nov 2023 by A Belal

I get tokenKey from path https://localhost:7107/api/login And when i try to test token and get data from Path https://localhost:7107/api/Values the token work good and data comes well but when i remove token the data continue come and...

Error in pagination data doesn't shown on page

29 Nov 2023 by A Belal

i want to do Pagination for View Page named ItemsList data comes well in Console in browser but it doesn't show on screen What I have tried: Array(10) 0 : {itemId: 2, itemName: 'MacBook Pro', salesPrice: 1339.69, purchasePrice: 1205.72,...

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...

How to create multilingual project with ASP.NET core MVC

22 Aug 2020 by ABAKh

I want to create Asp.net Core MVC multilingual Project, first i want to do the Multilingual Part, I'm going to do the project with Asp.net Core(MVC) 2019 and SQL Server 2016, so any help will be appreciated. Thank you, What I have tried: I...

MVC

How do I change the direction from RTL to LTR and vice versa in ASP.NET core MVC

3 Nov 2020 by ABAKh

I want to change the direction of the solution (RTL And LTR) when i selected the Language DropDown in (ASP.Net Core MVC) and i'm using BootStrap 3.3.7 for the design, i searched a lot but i didn't find proper solution, any help is appriciated. ...

MVC

How to disabled button for "next record" in C#

27 Feb 2017 by abdul subhan mohammed

Dear All,I have a list of candidates and i'm using "Previous" and "Next" button to view candidates.But for last page, i want to disable "Next" button.And i dont want to use/create new variable/member as "Total No. of Records".What I have tried:private void...

How to disabled button for "next record" in C#

27 Feb 2017 by abdul subhan mohammed

private void ValidatePagination() { if (grdCandidate.Items.Count

How to format htmllabel to display list in arabic in winforms c#.

7 Apr 2018 by abdul subhan mohammed

Dear All, I have Winform application where i have to display some html code for which, i'm using htmlLabel. I want to display ordered/unordered list with Arabic text. The htmlLabel is displaying the list with Arabic which is aligned to right also, but, the bullets are coming on left and text...

Windows

How to import data from excel to class in ASP.NET C#

7 May 2018 by abdul subhan mohammed

Dear All, I have an ASP.NET web application in C#. I want to import data from excel to Repeater using linq. The excel file contains company logo(Image), empty rows and multiple table with column names and row names. Example: ...

At least one object must implement icomparable. LINQ C#

23 Nov 2018 by abdul subhan mohammed

Dear All, I have a List and i'm appling GroupBy, Orderby & ThenBy using LINQ-C#. When i change the requestDate and remarks i'm getting the following erro. At least one object must implement IComparable. Description: An unhandled exception occurred during the execution of the current web...

LINQ

At least one object must implement icomparable. LINQ C#

23 Nov 2018 by abdul subhan mohammed

I got it! IEnumerable candidateRefundVoucherList = requestVouchers; var refundVouchers = candidateRefundVoucherList.OrderByDescending(d => d.RequestDate). GroupBy(r => r.RequestDate).Select(item => new { ID =...

LINQ

How to disable close application from taskbar in winform C#

4 Feb 2019 by abdul subhan mohammed

Dear All, I have win-form application. I want to prevent a closing application from the taskbar. I have added a button to close the application, the user should close the application by using this button only. What I have tried: I tried disabling mouse right click, but I don't think it a...

Axwindowsmediaplayer not displaying the video in winforms programmatically C#

20 Feb 2019 by abdul subhan mohammed

Dear All, I have one windows application where I want to play audio/videos files. First of all, I have added the reference to the WindowsMediaPlay in Com tab in my project solution. I have then added this as the tool by right-clicking in the menu tool and selected the WindowsMediaPlayer. What...

How to upload data with attachments in ASP.NET C#

9 Apr 2019 by abdul subhan mohammed

Dear All, I have a web application. The requirement is to upload the data using excel sheet with attachments. What I have tried: I have already completed upload data from excel sheet but I'm not able to upload the attachments files. Example data:...

Radio button isn't working in my view

4 Oct 2022 by Abdulmajeed Alotaibi

Hello , I have quiz Project And I Created a view for the candidate to start the exam , the Questions And Answers Loaded Correctly but when I check Answer for First Question and Select the answer in the Next Question the first question reset ,...

C#7.1

ASP.NET5

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 =...

The 'microsoft.ace.oledb.12.0' provider is not registered on the local machine.

12 Sep 2017 by Abhimaan Sharma

I tried to all the possible solutions, but code is not working. Getting same error again and again. Infact, I've installed the same from below link: https://www.microsoft.com/en-us/download/details.aspx?id=13255 What I have tried: string ExcelContentType = "application/vnd.ms-excel"; ...

Window authentication on WEB API in ASP.NET core

21 Mar 2017 by abhishek_singh

Hi,I have created a web api service with window authentication for Intranet users in ASP.NET Core, Authentication on service is working properly except that it accept all domain user which have valid credentials for requested machine, I just want that it validate for single domain users only,...

How to solve SQL server problem with ELMAH in ASP.NET MVC ?

5 Mar 2017 by Abrar Kazi

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...

C#7.0

Blazor

I have a problem in ASP.NET core MVC migration

20 Sep 2022 by Achraf Dahdah

Introducing FOREIGN KEY constraint 'FK_books_subCategories_SubCategoryId' on table 'books' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints. Could not create...

How to implement get and put API for updating two tables data using ASP.NET core.

12 Aug 2019 by adhikar patil

Hello, I have two tables - Student Table and Student address table and this tables having relation one to one and I want to write an Get and Put API for those two tables for fetching and updating data using Asp.Net Core with ViewModels. Student Table Columns- ...

I want to read json file data with specific json object array one by one using foreach loop in ASP.NET core.

11 Oct 2019 by adhikar patil

Hello, I want to read json file data with specific json object array one by one using Foreach loop and insert into database in Asp.net Core. I Have MasterData.json file { "M203StructureKind": [ { "Code": "1", "Description": "BRIDGE" }, { "Code": "2", "Description": "CULVERT" }, {...

I want to read json file data with specific json object array and insert bulk data in ASP.NET core.

JSON

15 Oct 2019 by adhikar patil

Hello, I want to read json file data with specific json object array and insert bulk data into database in Asp.net Core. I have two tables in Databse like naming as M203StructureKind, FlhDivision CREATE TABLE [dbo].[M203StructureKind]( [Id] [int] IDENTITY(1,1) NOT NULL, [Code]...

JSON

How to convert json object to datatable in ASP.NET core

17 Oct 2019 by adhikar patil

Hello, I want to convert Json object to DataTable. I have json file to insert bulk data into table using SqlBulkCopy string contentRootPath = _appSettings.MasterJsonPath; var folderDetails = Path.Combine(Directory.GetCurrentDirectory(),$"wwwroot\\{"MasterData\\masterdata.json"}"); ...

JSON

Blazor Confirmation Checkbox Component

6 Jun 2021 by aditya pewekar

Custom component to handle checkbox after confirmation modal popup

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...

Building String Razor Template Engine with Bare Hands (.NET Core)

25 Feb 2020 by ADOConnection

How ASP.NET Core Razor turns templates into assemblies and runs them

Jsonrequestbehavior.allowget does not exist in current context

21 Feb 2019 by afagh

I am using asp.net MVC core and I am going to read data from SQL in kendo drop-down list. I have installed Newtonsoft.Json library too. I see drop-down list but I can't load data in my drop-down list. my code is as below: What I have tried: my model is located in models>Airports.cs: ...

Importing MVC model class in ASP.NET core MVC with angular 2 application

31 Dec 2016 by Afzaal Ahmad Zeeshan

You can also "not" import anything at all, and use dynamic types to get the values. Most of the times when you have no idea about the schema implementations on the server, then you can easily use these types instead of mimicking the types. I wrote an article about JSON with C#, there this...

How to use AWS lambda service with ASP.NET core step by step

4 Mar 2017 by Afzaal Ahmad Zeeshan

AWS Lambdas are functions, not virtual machines to host a full application. The purpose of a Lambda is similar to a serverless architecture. Which means, you only write a single function there. Be it in C++, Python, C#, JavaScript or any other interpreted language that can be used there — C# can...

How to use Facebook account kit with ASP.NET core?

14 Apr 2017 by Afzaal Ahmad Zeeshan

No one is interested in paying for a full featured team to create an API for every particular platform — I am an ASP.NET Core developer, and I hate the fact that there are very less frameworks and APIs available to get things working. However, since there is no such library, what you need to...

Facebook-API

Some time it shows mail id, some time not

28 Jun 2017 by Afzaal Ahmad Zeeshan

There are several reasons why it would be blank, first thing to make sure of is, the session variable, always check its value before doing anything. if(Session["UserEmail"] != null) { string id1 = Convert.ToString(Session["UserEmail"]); // Continue } else { // Do not load anything,...

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

How do I save a view page (cshtml) to PDF using rotativa and ASP.NET core 2.0

31 Dec 2017 by Afzaal Ahmad Zeeshan

I believe so that you missed when the .NET Core 1.x was upgraded to .NET Core 2.0. For example, if you move ahead and check the existence of CookieAuthenticationOptions, you will not find it because it was removed. You need to change your code and then rebuild it. Read my article that I have...

PDF

DevOps on Azure with ASP.NET Core

1 Jul 2018 by Afzaal Ahmad Zeeshan

Overview of what DevOps has to offer and how you can kickstart your DevOps chains on Microsoft Azure

How to create dynamically sitemap.xml in .NET core 2 ?

13 May 2018 by Afzaal Ahmad Zeeshan

I currently have an application hosted that was built using ASP.NET Core 2.0, and that used the following NuGet package, GitHub - uhaciogullari/SimpleMvcSitemap: A simple library for creating sitemap files inside ASP.NET MVC and ASP.NET Core MVC applications[^], it was more than enough for me. ...

How to convert that code please from MVC project to web api ?

16 Feb 2019 by Afzaal Ahmad Zeeshan

As already mentioned in Solution 1, by MadMyche, you cannot simply convert your applications to an API, where API itself is a separate way or method of development of applications. An API has so many requirements, such as being stateless, headless, and cross-platform, and cross-device. APIs work...

WebAPI2

WebAPI

How to get last record+1 when create new employee on web API project ?

16 Feb 2019 by Afzaal Ahmad Zeeshan

Apart from what Solution 1 tells, I have to recommend another approach. That approach is, to use string as the ID field in Entity Framework Core, and framework will automatically use Guid to generate the unique IDs. I have always used this, and this lets me sleep peacefully at night. Make the...

Unable to configure ASP.NET identity 2.2 using ADO.NET

16 Nov 2019 by Afzaal Ahmad Zeeshan

This is quite unclear to me as to why you would not want to use Entity Framework, but would still want to use ADO.NET. The only help that Entity Framework provides is that it performs the underlying SQL for you, anyways. Maybe this might help you, ASP.NET Core Identity Without Entity Framework...

Difference between file symlink and an environment variable

31 Mar 2020 by Afzaal Ahmad Zeeshan

A QA is not well suited for such kind of questions, as they require a longer post (a technical blog/article) to answer properly. These two concepts are not new, and they are not specific to Kubernetes or containers. Symlinks are used to link...

Kubernetes

docker

React/ASP.NET core issue

8 Jan 2021 by Afzaal Ahmad Zeeshan

Quote: Why I can't upload an image to wwwroot folder? First of all, why would you want to have a web browser upload files to your wwwroot folder? That is one of the highest security loopholes that I can think of. Quote: But nothing happens....

React

Stripe.stripeexception: 'missing required param: amount.'

31 Mar 2021 by Afzaal Ahmad Zeeshan

Normally, if you are parsing the string values to integers the best approach is to handle when a string is not an integer. So, instead of: Convert.ToInt32(ViewBag.stripeTotal) I would recommend that you do: int amount = 0; if...

How to create dynamically sitemap.xml in .NET core 2 ?

14 May 2020 by agha.r

Can anyone tell me How to create a Site map in .net core 2 ? What I have tried: this article not working in core 2.

The value of 'author_book.bookid' is unknown when attempting to save changes.

29 Nov 2022 by ahmadamiri

hi everybody whats the cause and solution of the following error? InvalidOperationException: The value of 'Author_Book.BookID' is unknown when attempting to save changes. This is because the property is also part of a foreign key for which the...

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...

C#7.0

How to get english text of label from database based on table reference and field name as dynamically

How to represent multiple field in drop down in same time

9 Dec 2016 by ahmed_sa

I have model calender as following : [Table("Calender")] public partial class Calender { public Calender() { this.schedule = new List(); } [DatabaseGenerated(DatabaseGeneratedOption.Identity)] [Key] ...

22 Dec 2018 by ahmed_sa

How to get English text of label from database based on table reference and field name as dynamic... I make project in SQL server 2012 asp.net core 2.1 visualstudio2017 and technology i using entity framework core 2.1 . what I need is to get text of label control from database based on table...

How to use repeated get data from table from one place by using general function take table name or any solution

MVC5

29 Dec 2018 by ahmed_sa

how to use repeated get data from table from one place by using general function take table name. Problem: i use repeated more statement to get data actually i need to call it from one place if possible but cannot do that. so that i will not go every controller and repeat get data from...

MVC6

How to use entity framework with table that not have primary key or tables not haverelations

29 Dec 2018 by ahmed_sa

Problem How to use entity framework with database tables that not have primary key. i have old database made by SQL server 2012 i get requirement to work as entity framework technique and mvc . i suddenly found that more tables not have primary keys and no relation ship between some tables...

MVC5

entity-foundation

How to use save button to make save in both cases insert and update in create action HTTP post

7 Jan 2019 by ahmed_sa

Problem How to use save button in Create Action to make save in both cases insert and update using repository pattern ? and what changes i will make in view to accept update and insert . what i writing is when make new record or update record then use save button it will save using create...

.NET-Core

When display next record in create action I get error nullreferenceexception: object reference not set to an instance of an object

MVC5

How to load value of last employeeid + 1 in add action

6 Jan 2019 by ahmed_sa

I have controller name emp have action add i need when action add view loaded display last value increased by one in employeeid textbox meaning suppose i have in datbase employeeid 1 then when action add view loaded employeeid must have 2 so that how to do that please ? in action what i write ...

7 Jan 2019 by ahmed_sa

Problem When display next record of EmployeeId i get error on line below : Next NullReferenceException: Object reference not set to an instance of an...

When convert var nextid to integer get error how to solve error

7 Jan 2019 by ahmed_sa

when try to convert nextid to integer to assign to employeeid i get error as below System.InvalidCastException: 'Unable to cast object of type 'Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryable`1[System.Int32]' to type 'System.IConvertible'.' employee id is integer and error show on...

When run angular with webapi ASP.NET core project get error

12 Feb 2023 by ahmed_sa

I have application work in asp.net core 2.1 visual studio 2017 work with angular but when run page it show empty page i make inspect inside web page i get error as below Uncaught Error: inject() must be called from an injection context at injectInjectorOnly (core.js:1188) at inject...

Are data annotation allow to define compost key per model ?

18 Jan 2019 by ahmed_sa

Problem i work on asp.net core 2.1 visual studio 2017 code first with repository pattern when do create database i do as following Add-Migration InitialCreate but i got error Entity type 'Employee' has composite primary key defined with data annotations. To set composite primary key, use...

.NET-Core