How do I find out if a process is already running using c#?

Question

I have C# winforms application that needs to start an external exe from time to time, but I do not wish to start another process if one is already running, but rather switch

Answer 1

I have used the AppActivate function in VB runtime to activate an existing process. You will have to import Microsoft.VisualBasic dll into the C# project.

using System;
using System.Diagnostics;
using Microsoft.VisualBasic;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            Process[] proc = Process.GetProcessesByName("notepad");
            Interaction.AppActivate(proc[0].MainWindowTitle);
        }
    }
}