private void GradeClass() { LearnSite.BLL.Room room = new LearnSite.BLL.Room(); DDLgrade.DataSource = room.GetFindGrade(); DDLgrade.DataTextField = "Rgrade"; DDLgrade.DataValueField = "Rgrade"; DDLgrade.DataBind(); LearnSite.BLL.Room rm = new LearnSite.BLL.Room(); DDLclass.DataSource = rm.GetFindClass(); DDLclass.DataTextField = "Rclass"; DDLclass.DataValueField = "Rclass"; DDLclass.DataBind(); }