protected override void OnStartup(StartupEventArgs e){
// Get Reference to the current Process
Process thisProc = Process.GetCurrentProcess();
// Check how many total processes have the same name as the current one
if (Process.GetProcessesByName(thisProc.ProcessName).Length > 1)
{
// If ther is more than one, then it is already running.
MessageBox.Show("Another Instance is already running.");
Application.Current.Shutdown();
return;
}
base.OnStartup(e);
}
