Restrict Users to Launching Only One Instance of an Application

Use this code to make sure that users can only launch one instance of an application.

static void Main() {	Process ThisProcess = Process.GetCurrentProcess();	Process [] AllProcesses = Process.GetProcessesByName(ThisProcess.ProcessName);	if (AllProcesses.Length > 1)	{		MessageBox.Show(ThisProcess.ProcessName + " is already running",ThisProcess.ProcessName, MessageBoxButtons.OK, MessageBoxIcon.Error);	}	else	{		Application.Run(new MainForm());	}}
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