public static bool CheckProcessIsRun(string sProcessName){
			return (System.Diagnostics.Process.GetProcessesByName(sProcessName).Length _
  > 0);
		}
 
		private void button5_Click(object sender, System.EventArgs e){
			String sProcessName = "calc";
			bool b = CheckProcessIsRun(sProcessName);
			if (b){
				MessageBox.Show("Programm " + sProcessName + " läuft."); 
			}
			else{
				MessageBox.Show("Programm " + sProcessName + " läuft nicht."); 
			}
		}