Compter le nombre de visites avec Global.asax

// ...
namespace ...
{
	public class Global : System.Web.HttpApplication
	{
		public static int nbUsers;
		protected void Application_Start(Object sender, EventArgs e)
		{
			nbUsers = 0;
		}
		protected void Session_Start(Object sender, EventArgs e)
		{
			nbUsers++ ;
		}
		protected void Session_End(Object sender, EventArgs e)
		{
			nbUsers-- ;
		}
		//...
	}
}