Can i create a specific counter module for my website??

Thanks so much!! I will try it now.I hope it's ok!!

you can create the control and add it to the toolbox i guess, below code will get the count and you can access these variables from your control (Note you need to add this code in global file):

void Application_Start(object sender, EventArgs e)
{
        Application["OnlineUsers"] = 0;
       Application["PersonVisited"] = 0;
}

void Session_Start(object sender, EventArgs e)
{
Application.Lock();
Application["OnlineUsers"] = (int)Application["OnlineUsers"] + 1;
Application["PersonVisited"] = (int)Application["PersonVisited"] + 1;
Application.UnLock();
}

void Session_End(object sender, EventArgs e)
{
Application.Lock();
Application["OnlineUsers"] = (int)Application["OnlineUsers"] - 1;
Application.UnLock();
}