Problem with WCF session

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C#

.NET

WCF

WCFServices

Hi guys i have problem with my WCF service
i create service run on wsHttpBinding and use instance per-session
it's small service that count number automatic

service code:

static int m_counter = 0;
public string MyMethod()
{
  
    m_counter++;

    return m_counter;

}

my problem it's when i re-connect i get the last number again not start from 0 but session id changed !

client code:

static void Main(string[] args)
 {
     for (int i = 0; i < 5; i++)
     {
         Service1Client proxy = new Service1Client();
         proxy.Open();
         string sessionid = proxy.InnerChannel.SessionId;
         Console.WriteLine("Session id is: " + sessionid);
         Console.WriteLine("Data is: " + proxy.MyMethod());
         proxy.Close();
     }
     Console.ReadKey(true);
 }