Issue on ShowDialog()

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I'm having an issue using the method ShowDialog() in my application. It runs in a WTS server, and there are thin clients that log in that server to run the application.
I was having some problems that when the user opens the window, the system just crashes and they cannot do anything more, then I had to force the logoff of their thin clients.
I put a timer that if the thread isn't closed in 30s the system logs off to avoid these crashes, and then log on again automatically, but it's just until I can't resolve the real issue.
Then I put a try/catch block in the ShowDialog call, but it simply doesn't catch anything and the system still crashes.

I simply can't debug that because it doesn't happens all the time. In my PC it never happened, and they use most of the time normally, but sometimes this happens and that really bugs me.

Anyone has something that could help me?

C#

try
    {
        //I tried like this:
        //base.ShowDialog();

        //and then like this (FPrincipal.ActiveForm is the Form that call this modal window)
        base.ShowDialog(FPrincipal.ActiveForm);
    } 
    catch (ArgumentException e)
    {
        sendsEmail();
        
    } 
    catch (InvalidOperationException e)
    {
        sendsEmail();
    }

This is a old project, it was made in VS2008 and uses .net Framework 2.0.

Thanks a lot!

Posted 6-Feb-14 7:33am

Marcelo Camillo

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Comments

Vedat Ozan Oner 6-Feb-14 13:56pm

exception may not be ArgumentException or InvalidOperationException. What don't you try to catch all? catch(Exception ex) { processException(ex); }

Marcelo Camillo 6-Feb-14 14:12pm

I forgot to mention but I've already tried that and it didn't work. So I looked what exceptions this method throws and put both specifically, and still doesn't catching anything. But thanks for the suggestion!

ZurdoDev 6-Feb-14 14:28pm

Popping up a window in a Terminal Server used to be an issue years ago. I'm surprised you're still having this issue. What version of Terminal Server?

Marcelo Camillo 7-Feb-14 5:30am

We use Windows Server 2003.

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Vedat Ozan Oner · Accepted Answer · 2014-02-06T09:04:00

Please try the following code. I think you can find the reason, or at least stops crashing.

C#

using System;
using System.Collections.Generic;
using System.IO;
using System.Windows.Forms;

namespace Test_UnhandledException
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            // unhandled exception handling
            Application.ThreadException += Application_ThreadException;
            Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException);
            AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;

            // starting form1
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }

        static void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
        {
            AddLog((Exception)e.ExceptionObject);
        }

        static void Application_ThreadException(object sender, System.Threading.ThreadExceptionEventArgs e)
        {
            AddLog(e.Exception);
        }

        static void AddLog(Exception exception)
        {
            try
            {
                using (StreamWriter sw = new StreamWriter(@"d:\tmp\app.log", true))
                {
                    sw.WriteLine(exception.ToString());
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }
    }
}