protected void Page_Load(object sender, EventArgs e)
 {
     if (!IsPostBack)
     {
         rcbTerm.DataTextField  = "tterm";
         rcbTerm.DataValueField = "tterm";
         rcbTerm.DataSource     = cmb.GetAllTermByStudent(Session[sessionNames.userID_StudentOstad].ToString());
         rcbTerm.DataBind();
         rcbTerm.Items.Insert(0, new RadComboBoxItem("انتخاب نمایید"));
     }
 }