Start and Kill Processes in C#

A system process is uniquely identified on the system by its process identifier. Using the Process component, you can obtain a list of the processes that are running, or you can start a new process in the system. The System.Diagnostics namespace provides classes that allow you to interact with system processes, event logs, and performance counters.

  Process[] _proceses = null;
  _proceses = Process.GetProcessesByName("calc");

Process.GetProcessesByName("calc") - Creates an array of new Process components and associates them with all the process resources on the local computer that share the specified process name. The following C# program allows to start multiple calculator applications and later it kill the same instances of all calculator applications.

using System;
using System.Windows.Forms;
using System.Diagnostics;

namespace WindowsFormsApplication1
{
	public partial class Form1 : Form
	{
		public Form1()
		{
			InitializeComponent();
		}

		private void button1_Click(object sender, EventArgs e)
		{
			System.Diagnostics.Process.Start("calc");
		}

		private void button2_Click(object sender, EventArgs e)
		{
			Process[] _proceses = null;
			_proceses = Process.GetProcessesByName("calc");
			foreach (Process proces in _proceses)
			{
				proces.Kill();
			}
		}
	}
}