/// <summary>
/// set The custom string to check if the LIst of users have changed
/// and consider the page
/// </summary>
/// <param name="context"></param>
/// <param name="arg"></param>
/// <returns></returns>
public override string GetVaryByCustomString(HttpContext context, string arg)
{
if (arg == "CountUsers")
{
IDataContext<Person> dt = new TestDataContext();
return context.Request.Url.Query + dt.CountUsers().ToString();
}
return "";
}
