C# Discussion Boards - CodeProject

Re: QuickBooks questions

Mycroft Holmes6-Sep-09 0:25

Mycroft Holmes

6-Sep-09 0:25

You need to do some research [^]for this type of question, you are not the first....

Never underestimate the power of human stupidity
RAH

webcam

sos_amin5-Sep-09 23:24

sos_amin

5-Sep-09 23:24

what connection webcam in c#

Re: webcam

Manas Bhardwaj6-Sep-09 1:15

Manas Bhardwaj

6-Sep-09 1:15

First of all the only guess I could make of this question is that you want to connect to Webcam using C# right?

But, you need to tell us what the problem is and how far you you have done.

Anyways, Google [^]might me helpfull to you.

Manas Bhardwaj
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getting a date format

EmZan5-Sep-09 22:30

EmZan

5-Sep-09 22:30

i have a problem in comparing two dates

string x = textbox1.text

where textbox1.text is in the format of "dd MMMM yy"

i when i'm trying to parse that text to date error message appearse telling me that it's not valid

what i need is to compare this date to another date from another textbox

what should i do?

thanks in advance

Re: getting a date format

Abhishek Sur6-Sep-09 0:00

Abhishek Sur

6-Sep-09 0:00

Use

DateTime.ParseExact("datestring", "formatstring", new CultureInfo("en-US"));

I think this will do the trick.

Abhishek Sur

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Re: getting a date format

Luc Pattyn6-Sep-09 1:00

Luc Pattyn

6-Sep-09 1:00

- use one of the Parse methods in DateTime class to create a DateTime instance; I use TryParse quite a lot.
- compare two DateTimes, don't work with strings for this

Smile | :)

Luc Pattyn

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Re: getting a date format

EmZan6-Sep-09 1:43

EmZan

6-Sep-09 1:43

thanks Guys it works Big Grin | :-D

combining VB into C#

Kobi_Z5-Sep-09 20:58

Kobi_Z

5-Sep-09 20:58

hi,
I will give an example to what i want.

I made a VB project named Project1, inside it i have Module1 and inside it a function named Fnc_xxx.
if i put this project into a solution together with C# project
how can i make a button in the C# form call the Fnc_xxx from the VB project.

thanks in advance.

Re: combining VB into C#

OriginalGriff5-Sep-09 22:09

OriginalGriff

5-Sep-09 22:09

In your C# project, add a reference to your VBProject (Right click "References", "Add Reference..." then select the "Projects" tab and pick "VBProj" or whatever your VB project is called).
Then:

VBProj.Form1 f1 = new VBProj.Form1();
string s = f1.FNC_xxx();

The "Using" statement will work here, too.

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Re: combining VB into C#

Kobi_Z7-Sep-09 1:24

Kobi_Z

7-Sep-09 1:24

It is workin great, thank you.

can you tell me few more things:
1) how can I make it press a button ? (it seems i can only call functions).
2) how can I make it call a function from a Module in the vb project.
3) whats the full syntax for the "Using" statment ?

forgive my ignorance.

thanks in advance Smile | :)

Re: combining VB into C#

OriginalGriff7-Sep-09 5:01

OriginalGriff

7-Sep-09 5:01

Lets deal with these in reverse order:
3) Look at the top of your C# source file. See the top five or more lines, all starting "Using"? Those are the using statements, predictably enough! Laugh | :laugh:

All they do is stop you having to use the full name of an item when you use it. So, the "Using System.IO" statement means that you can write

string[] lines = File.ReadAllLines(@"C:\temp.txt");

instead of

string[] lines = System.IO.File.ReadAllLines(@"C:\temp.txt");

In the previous example, "Using VBProj" means you can say

Form1 f1 = new Form1();

instead of

VBProj.Form1 f1 = new VBProj.Form1();

2) See the example I gave you, which called a function from a module in VB?

1) You can't make it press a button. The user presses the buttons. What I think you mean is, "how do I get the notification that the user has pressed a button?" which is simple, just hook into the handler as normal:

butOK.Click += new EventHandler(butOKEndEdit_Click);

Anything you could do in VB, talking to a VB module, you can do in C#, talking to a VB module. .NET doesn't care what language you wrote the .NET code in, it all works seamlessly.

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Re: combining VB into C#

OriginalGriff7-Sep-09 5:02

OriginalGriff

7-Sep-09 5:02

Sorry for the delay in replying, BTW, but my phone line was down so no internet. Cry | :((

All fixed now. Big Grin | :-D

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Re: combining VB into C#

Kobi_Z7-Sep-09 19:39

Kobi_Z

7-Sep-09 19:39

Thanks again,

I managed using the Module throgh the VBproject as reference.

Is there a way to Create a C# project (w/o any VBproject reference in it)
and add a vb Module to it ?
I tryed but failed.

Thanks.

modified on Tuesday, September 8, 2009 1:52 AM

Re: combining VB into C#

OriginalGriff7-Sep-09 21:54

OriginalGriff

7-Sep-09 21:54

I you mean "Can I have a project with a C# source file and a VB source file in it?" then no. You can have a solution with a C# project, and a VB project though.

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Deserialize from 2.0 to 1.1 framework

nryk5-Sep-09 20:57

nryk

5-Sep-09 20:57

i'm using 1.1 framework and my customer using 2.00 framework.
he is saveing a Serialized file that have MemoryStream.
when i'm trying to Deserialize the file i get an Exception.
(if i try to Deserialize in 2.00 framework it's ok)
how can i Deserialize in 1.1 framework ?

Re: Deserialize from 2.0 to 1.1 framework

OriginalGriff5-Sep-09 21:34

OriginalGriff

5-Sep-09 21:34

Which serializer are you using? If it is XML, then you stand a chance of reading different framework versions, but Binary is very unlikely to work. This is an unusual situation, the normal way round is for the customer to have the more outdated software!

There are two ways I can think of:
1) Install framework 2.0 - this would be the better long term solution. In fact, go the whole hog and go for the latest version!
2) Create a 2.0 version of your app, deserialize. Manually write all the important data to a separate file. Create a special version of your 1.1 app, which can read the separate file. Serialize. Do not loose the two intermediate programs as you will need them again if you do. Create copious notes on what to do, how, and why.

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Re: Deserialize from 2.0 to 1.1 framework

nryk5-Sep-09 22:32

nryk

5-Sep-09 22:32

the file is Binary.
the problem is that my program is distribute to a lot of people,
and i have a problem when tomorrow microsoft develop 4.00 or 5.00 or 6.00 framework version,
and i can't compatible my old version to the new one.

Re: Deserialize from 2.0 to 1.1 framework

OriginalGriff5-Sep-09 22:53

OriginalGriff

5-Sep-09 22:53

Then you realy have no choice but to create intermediate programs to use to solve the problem each time it occurs.
I would strongly suggest you look at moving to XML serialization for the next version, with a conversion program to update older data files from 1.1 (or 2.0) to the latest version.
Not that it's a lot of help to you, but I do generaly try to avoid serialization for just this reason - it's not always avoidable, so use the most portable version you can!
Good luck!

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Re: Deserialize from 2.0 to 1.1 framework

Henry Minute6-Sep-09 0:19

Henry Minute

6-Sep-09 0:19

Take a look at Custom Serialization - MSDN[^] to see if it is of any help.

From the page.

By controlling serialization, it is possible to ensure serialization compatibility, which is the ability to serialize and deserialize between versions of a type without breaking the core functionality of the type.

Henry Minute

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Error when Connection Crystal Report with database visual studio 2005 [modified]

xodeblack5-Sep-09 20:22

xodeblack

5-Sep-09 20:22

When I open crystal report(In Visual Studio 2005 project) and then go in field explorer.right click
on 'Database fields'>then choose 'database expert'
>Then create new connection>then choose 'OLE DB(ADO)' >Then Choose 'Microsoft OLE DB Provider for SQL' from List > Then Click next ........

Then system ask for Server name,username,password,
Database name and Integrated security.

I give all info correct but following error occur

Logon Failed.
Details: ADO Error code: 0x
Source: Microsoft OLE DB Provider For SQL Server
Description: [DBNETLIB][Connection Open (Connect()).] SQL Server does not exist for access denied.
SQL State: 08001
Native error:

There is only Problem in report not project.
project is running fine. it connects database,fetch and insert data without any error

Thankz in advance
Regards
Kashif

modified on Wednesday, September 9, 2009 5:19 AM

Click Once Deployment

Abdul Rahman Hamidy5-Sep-09 18:15

Abdul Rahman Hamidy

5-Sep-09 18:15

Dear All,
I am trying to establish setup using Click Once Deployment. I have following questions.
1. My Application for sure uses .Net framework 2.0, can we integerate .Net Framework into my setup project which should be installed prior to application setup?
2. My Application also requires Adobe Acrobat Plugin to read PDF Files, can we integrate PDF Reader or any other resoures "DLLs of Adoble Only" into My Application which should be installed prior to My Application setup?

Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan

Re: Click Once Deployment

MarkB7775-Sep-09 18:40

MarkB777

5-Sep-09 18:40

Hi Abdul,

If you open your project properties, and look in the "publish" section, you can find settings for all of this (required assemblies etc etc).

Click Once enables you to create a bootstrapper that will install additional software, either from the server you are hosting the application on, or from the vendors homepage.

Hope this helps,

Mark Brock
"We're definitely not going to make a G or a PG version of this. It's not PillowfightCraft." -- Chris Metzen

Double class problem

Malbinir5-Sep-09 15:39

Malbinir

5-Sep-09 15:39

hi,
Lets say i have a class named 'MyClass'. This class contains a field, 'Key', that behaves like a PK for all of the class instances, means that only one instance can have the value X for this 'Key' field.

Now i need to serialize this class and transfer it, but if the other side already has a 'MyClass' instance with the same 'Key' value i get two instances contains the same 'Key' field value... Problem.

ideas?

thanks Smile | :)

Re: Double class problem

Luc Pattyn5-Sep-09 16:04

Luc Pattyn

5-Sep-09 16:04

Hi,

two ways to solve this:

1.
you allow identical keys on different machines; then you have to decide what must happen when a key clash occurs (e.g. local one wins; incoming one wins; both instances get merged somehow; ...) That becomes a functional spec.

2.
you do not allow identical keys on different machines. Make your key generator such that it cannot happen. simple example: give each machine a range of non-overlapping available keys. For up to 16 machines: assign a number N in [0,F] to each machine, and make sure each key (looking at it in hex) ends on the machine number N (so 16*sequentialNumber+N).

Smile | :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

Re: Double class problem

Malbinir5-Sep-09 21:35

Malbinir

5-Sep-09 21:35

The key is intentionally the same, so the second idea is out.

The first idea seem to be good but i feel i miss a much easier solution like changing the deserialization behavior...

Is there is a way to cause the deserialization process to return an existing instance instead of creating a new one?

thanks.

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