how can call a notification method like fb in asp.net

i Have write anotification code but i dont understand how can i call a aspx page method ,

my requirement is when i click notification  tab then notification data load and display as popover like facebook...

my notification code is

void notificationBind()
{
var noti = cs.da.NotificationProcedure(Convert.ToInt32(Session["Id"]));
DataList3.DataSource = noti;
DataList3.DataBind();
}

thankyou please help guys