Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            // handle the exception raised by main threads
            Application.ThreadException +=
            new System.Threading.ThreadExceptionEventHandler(Application_ThreadException);

            // handle the exception raised by additional threads
            AppDomain.CurrentDomain.UnhandledException +=
            new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());

        }

        static void Application_ThreadException (object sender, System.Threading.ThreadExceptionEventArgs e)
        {// All exceptions thrown by the main thread
            ShowExceptionDetails(e.Exception);
        }

        static void CurrentDomain_UnhandledException (object sender, UnhandledExceptionEventArgs e)
        {// All exceptions thrown by additional threads
            ShowExceptionDetails(e.ExceptionObject as Exception);
        }

        static void ShowExceptionDetails(Exception Ex)
        {// logging of exception details
            MessageBox.Show(Ex.Message, Ex.TargetSite.ToString(), MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }
}

Mixed mode assembly is built against version 'v2.0.50727' of the runtime and cannot be loaded in the 4.0 runtime without additional configuration information...
App.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
  </startup>
</configuration>

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