need a code.

You can refer the following URL:

http://www.stardeveloper.com/articles/display.html?article=2002102501&page=1

You also can refer the following code:

protected void Page_Load(object sender, EventArgs e)
    {
        Application.Lock();
        if(Application["HitCount"]!=null)
         {
            Application["HitCount"]=(int)Application["HitCount"]+1;
         }
        else
         {
             Application["HitCount"] =1;
         }
         Application.UnLock();
        lblInfo.Text="The page has been accessed ("+Application["HitCount"].ToString()+") times";
    }

hi ,
You can count the no of user requested your site by writing code in the global.asax file. in that file there is a method called application_sessionstart.create one variable which is a globar variable.