Preventing user to open duplicate windows application,while it is running.

using System.Windows.Forms;

using System.Data;

using System.Globalization;

using System.Configuration;

using System.Diagnostics;

namespace my_application

{

public class form1 : System.Windows.Forms.Form

{

private static bool m_blnRunning = false;

[STAThread]

static void Main()

{

Find("myapplication"); //myapplication is my solution name.

if (m_blnRunning == true)

{

MessageBox.Show("Application is already running!");

return;

}

Application.Run();

}

private static void Find(string processName)

{

int intCount = 0;

try

{

foreach (Process thisproc in Process.GetProcessesByName(processName))

{

intCount = intCount + 1;

if ((intCount == 2))

{

m_blnRunning = true;

}

}

}

catch (Exception ex)

{

throw new Exception(ex.Message);

}

}

}

}