This tutorial will help, preventing more then one instance of any application, which contains this code in form_load event.
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bool isInstanceExisting= false;
Mutex objMutex = new Mutex true, "Application_Mutex", out isInstanceExisting);
if (!isInstanceExisting)
{
this.Dispose();
return;
}
bool isInstanceExisting= false; Mutex objMutex = new Mutex( true, "Application_Mutex", out isInstanceExisting); if (!isInstanceExisting) { this.Dispose(); return; } (If this comment was disrespectful, please report it.)
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10/15/2006 5:58:44 PM: 
