class Program

    {

        

static 

void Main()

        {

            

const 

string MutexName = 

"

CSharpThreadingCookbook

";

            

using (

var m = 

new Mutex(

false, MutexName))

            {

                

if (!m.WaitOne(TimeSpan.FromSeconds(

5)))

                {

                    Console.WriteLine(

"

second instance is runing

");

                }

                

else

                {

                    Console.WriteLine(

"

Runing

");

                    Console.ReadKey();

                    m.ReleaseMutex();

                }

            }

        }

    }