C# Discussion Boards - CodeProject

Re: DataBinder.Eval: 'System.Data.Common.DbDataRecord' does not contain a property with the name REPORTTO

Heath Stewart3-Oct-04 9:14

3-Oct-04 9:14

This question should be posted in the ASP.NET forum.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

[My Articles]

Avoiding Win32 dependancy

Andres Coder3-Oct-04 6:03

Andres Coder

3-Oct-04 6:03

While learining .NET, I've come across some concepts that I'm not sure if I should avoid them. What I mean is that I've been told that I should avoid using Win32 API calls and stuff like that in a dotNet application (just write pure .NET and not involve Win32 directly in my application). But I'm not sure about if it's possible and even wise. Is it ?

Any good article somewhere how to avoid Win32 dependancy (to ensure Mono/Linux compatibility) ?

There are some objects that I'm not familiar wether they're .NET or Win32:

1. System.Windows.Forms.Message - as I've understood so far, Win32 uses messages and dotnet not. So it's a wrapper to Win32 message ? Should I use messages when developing user interface in C# ?

2. Hooks - if I'm already dealing with messages there's no need to avoid them, right ?

3. Handles - System.IntPtr - I have a feeling they're also more Win32 than dotNet ... are they ???

I hope the questions make sense at all ...

Regards, Desmond5

Re: Avoiding Win32 dependancy

Heath Stewart3-Oct-04 9:13

Heath Stewart

3-Oct-04 9:13

The best place to get answers for these are on the forums for Mono, .Gnu, and Portable.NET.

Most of the base class library encapsulates native Win32 functionality, BTW, not just Windows Messages. Most of the Windows Forms controls encapsulates the Windows Common Controls while much of the System.Drawing classes encapsulate GDI+. The list goes on.

The fact of the matter is that what's on the surface is what counts. So long as the base class library in the non-.NET implementation of the Common Language Infrastructure (CLI) implements the same Types and Type members, you'll be fine (and also that the assemblies have the same strong name).

While System.Windows.Forms.Message may not be good to use, you don't have to so long as you don't try to implement Common Control custom functionality (like custom drawing).

An IntPtr, BTW, is just a native handle, which is a 32-bit integer on 32-bit platforms and 64 bits on 64-bit platforms.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

[My Articles]

regex question

g00fyman3-Oct-04 3:13

g00fyman

3-Oct-04 3:13

hey to all,

i am trying to parse a source file to determine the class name from its signature using regex

i can get it as long as the file doesnt include anything after the '{' in the signature,

can anyone offer help pls?

[code]
Regex regex = new Regex(@"(?<=\bclass\s+\b)\w+(?=\s*\{)");

this works fine for examples like:

// this is class file

public class Tester
{

}

internal class InternalTester{

}

// output misses commented 'class' keyword, this is good Smile | :)

[/code]

but if i have say a java example or if i extend a class it fails

like:

[code]
public class Form1 : System.Windows.Forms.Form
{
}

// or java

public class Listener extends Thread
{

[/code]

also i would like to be able to change the keyword it is trying to find with something this (which is wrong)

[code]
static string KEYWORD = "class";

Regex regex = new Regex(@"(?<=\b" + KEYWORD + "\s+\b)\w+(?=\s*\{)");
[/code]

any suggestions pls ?

kind regards

maurice

Re: regex question

Not Active3-Oct-04 5:20

Not Active

3-Oct-04 5:20

Doesn't answer your question but it may help

Regulator[^]

character escaping problem

sween33-Oct-04 3:10

sween3

3-Oct-04 3:10

I am trying to escape quotations in the following scenario:

I have a string variable, and text that I need to pass to a system command. But I need to include quotes IN one of the elements of the system command.

string gar = "Variable";
string subject = gar + "Here is some more text";

System.Diagnostics.Process.Start("command.bat" + gar);

The kicker for me is that the subject MUST include quotes (") around the entire variable to the command line like this:

c:\command.bat "Variable Here is some more text"

Any ideas ?

--
sween

Re: character escaping problem

Stefan Troschuetz3-Oct-04 3:57

Stefan Troschuetz

3-Oct-04 3:57

How about this:

string subject = "\"" + gar + "Here is some more text\"";

www.troschuetz.de

Re: character escaping problem

sween24-Oct-04 2:25

sween2

4-Oct-04 2:25

Thank you!!!!

--
sween

Request a new login

quilkin3-Oct-04 2:25

quilkin

3-Oct-04 2:25

I need to programatically bring up the Windows logon dialog. I don't want to find any usernames or passwords, just force the user to re-enter his credentials - this is to prevent unauthorised users from changing settings in the application if the authorised user has walked away from his desk for a few minutes.
There must be a simple c# method that does this!

Re: Request a new login

Dave Kreskowiak4-Oct-04 7:12

Dave Kreskowiak

4-Oct-04 7:12

Actually, I think you want to enable the screen saver and make sure that it is asking for a password to unlock. You can't force the Windows Login to show up again just to authenticate.

If your application times out and locks itself, you have to put up your own form to capture credentials, then you can pass those to something like Active Directory to authenticate.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Request a new login

quilkin4-Oct-04 7:42

quilkin

4-Oct-04 7:42

Thanks, OK, but is there a way to force the screensaver to come up immediately? I just want to ensure that, when someone presses a 'save' button that changes a database, they immediately get a request for credentials.
I don't want to create a new form to capture credentials since there is no way to check the Windows NT password.

Re: Request a new login

Anonymous4-Oct-04 8:13

Anonymous

4-Oct-04 8:13

using System.Diagnostics

Process.Start("scrnsave.scr");

Re: Request a new login

Anonymous4-Oct-04 11:17

Anonymous

4-Oct-04 11:17

using System;
using System.Runtime.InteropServices;

[DllImport("user32.dll")]
public static extern void LockWorkStation();

LockWorkStation();

windows forms repeater?

Roger Alsing2-Oct-04 23:52

Roger Alsing

2-Oct-04 23:52

Hi,

im fiddling around a bit with a repeater for win forms
and just wanted to see if there is a need for such component or if its just plain stupid :P
the idea is pretty much to make it somewhat like an editeble report.
and let users edit data in a gui that actually look like something rather than just tabular data as in normal grids

and also , any feature suggestions?

http://www.compona.com/winrepeater.gif[^]

//Roger

Need help coding a basic C# program

Member 13850492-Oct-04 22:08

Member 1385049

2-Oct-04 22:08

Hello,
I am self learning C# (visual C#) and I am doing some basic project. I just need some help in how I should code this program. I kind of thought through it, but i am trully not doing good. Just to keep moving, I thought I would ask for help in here. Here it is:

Write a program that will implement a Complex class and a simple Main program that will demonstrates the use this class.
You must create two classes. Complex stores its real part and imaginary part. Add a few constructors to allow statements like these ones:

Complex plxZ;
Complex plxX = new Complex (4.5, 6.0);
Complex plxY = new Complex (plxX);

Add five operators (+ - * / ^) to allow statements like these ones:

plxZ = plxX + plxY;
plxZ = plxX ^ 7;

Override the ToString() method to allow statements like these ones:

tbOutSum.Text = plxZ.ToString ();

Create a simple Main class to use Complex. This should allow the user to enter complex numbers and an integer, and then demonstrate the five operations on these numbers.

I will trully appreciate any help on this matter, Sigh | :sigh:

Thank you in advance,
A Newbie In Tha Block

Re: Need help coding a basic C# program

Stefan Troschuetz2-Oct-04 23:44

Stefan Troschuetz

2-Oct-04 23:44

What are your concrete problems? Where are you stuck?

Just providing your task gives the impression that you want us to write the whole code for you, but i don't think this is the case here.?

www.troschuetz.de

Adding Application on windows start up

Zapss2-Oct-04 18:30

Zapss

2-Oct-04 18:30

Hello,
how can i add c# application on windows start up.
i dont want to add in start up folder.Is there any othere
way? like yahoo messanger which is not appeared D'Oh! | :doh:

in start up
folder..

Re: Adding Application on windows start up

Nnamdi Onyeyiri3-Oct-04 0:04

Nnamdi Onyeyiri

3-Oct-04 0:04

Put a value for it in one of the following folders.

For All users:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

For the current users:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run

website // Project : AmmoITX //profile
Another Post by NnamdiOnyeyiri

Re: Adding Application on windows start up

Zapss3-Oct-04 21:16

Zapss

3-Oct-04 21:16

How can i add this from c# application?any example

Re: Adding Application on windows start up

Nnamdi Onyeyiri4-Oct-04 1:30

Nnamdi Onyeyiri

4-Oct-04 1:30

using Microsoft.Win32;
.....
RegistryKey hkcu = Registry.CurrentUser;
RegistryKey run = hkcu.OpenSubKey("Software\\Microsoft\\Windows\\CurrentUser\\Run");
 
run.SetValue("MySoftware", "C:\\Path\\To\\Software.exe");

something like that should do the trick.

website // Project : AmmoITX //profile
Another Post by NnamdiOnyeyiri

Re: Adding Application on windows start up

Member 12723814-Oct-04 19:17

Member 1272381

4-Oct-04 19:17

using Microsoft.Win32;

string strAssemblyPath;
strAssemblyPath = System.IO.Path.GetDirectoryName(base.Context.Parameters[ASSEMBLYPATH_STATENAME]);
Process.Start(strAssemblyPath+"\\Application.exe");

RegistryKey MainKey;
MainKey=Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths");

RegistryKey ApplicationKey=MainKey.OpenSubKey("Application",true);

ApplicationKey.SetValue("Application.exe",strAssemblyPath+"\\Application.exe");

Check the Above code written in c#. This Code i have written for writting my application path into registry.

And u can add the application to the Start up in another way also.

Check while creating setup u can create a chort cut to the start menu startup folder. that will also run the application.

Arun Kumar Sabat

Re: Adding Application on windows start up

Zapss5-Oct-04 18:31

Zapss

5-Oct-04 18:31

Thanks for your replay.
i have another doubt?
how can i hold system shut down process
until user close my c# application properly...

Scrolling Two Datagrids Simultaneously

RFickling2-Oct-04 18:13

RFickling

2-Oct-04 18:13

Hi,

I have two datagrids on a WinForm. I want to keep them synchronized so that when the user scrolls one of them, I can programmatically scroll the other one an equal amount. The datagrid is new to me. How can I do that?

Royce

Re: Scrolling Two Datagrids Simultaneously

Heath Stewart3-Oct-04 9:29

Heath Stewart

3-Oct-04 9:29

If you had searched for answers to your problem first, you may have run across http://www.codeproject.com/script/comments/forums.asp?msg=911474&forumid=1649#xx911474xx[^], which describes the solution to what you're searching for. The fact that this is for a RichTextBox doesn't matter; the same solution works for practically all scrollable controls so long as the controls that they encapsulate handle the standard scrolling messages.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

[My Articles]

Weird Memory Problem

matthias s.2-Oct-04 17:54

matthias s.

2-Oct-04 17:54

Hi,

I'm using C#Express Beta and accordingly the framework 2.0.

I recently realized that my application, when starting has a workingset peak of ~128 MB. WTF | :WTF:

I startet wondering a bit because the application didn't yet do anything really usefull.

So I fired up the IDE, created an empty WinForms project and compiled a release build. Please note that I have not added any extra code! Here is what I have figured out:

1. On launching the resulting exe, the TaskManager shows a workingset of ~70 MB.

2. When I minimize the MainForm window the workingset shrinks to ~400 KB.

3. Maximizing the window again results in a workingset of ~1460 KB, which I could live with.

Does anyone have an idea how to go on about this?

Confused | :confused:

BTW.: Is there a way to monitor in detail what and where and how your application is using up the memory? I have a monitor to get information as of what modules are loaded, but is ther a way to figure out of what classes or resources are taking up the space?

Any pointers are highly appreceated.

Thanks in advance,

Matthias

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