Code For Counting total Login User of website

public class Global : System.Web.HttpApplication
    {
        public static int OnlineUsers { get; set; }

        void Application_Start(object sender, EventArgs e)
        {
            OnlineUsers = 0;
        }
        void Application_End(object sender, EventArgs e)
        {
            //  Code that runs on application shutdown
        }
        void Application_Error(object sender, EventArgs e)
        {
            // Code that runs when an unhandled error occurs
        }
        void Session_Start(object sender, EventArgs e)
        {
            OnlineUsers++;
        }
        void Session_End(object sender, EventArgs e)
        {
            OnlineUsers--;
        }
    }

lblOnlineUsers.Text = "Online Users: "+ Global.OnlineUsers;

void OnlineUser_Start(object sender, EventArgs e)

{

    OnlineUser["User"] = 0; //Initially By Zero(0).

}



//Method For Counting Online Users...


void UserCount_Start(object sender, EventArgs e)

{

    int count;

    count = (int)OnlineUser["User"];

    count = count + 1;

    OnlineUser["User"]=count;

}





protected void Page_Load(object sender, EventArgs e)
{
    Response.Write(OnlineUser["User"].ToString()); 
}