protected void search_btn_Click1( object sender, EventArgs e ) { Data.DataBase.assignmentsDataTable table = new Data.DataBase.assignmentsDataTable(); BusinessTier.Admin admin = new BusinessTier.Admin(); string input = this.textbox_assgin.Text.ToString(); if ( input.Length > 0 ) { int assign_id = int.Parse(input); table = admin.SelectAssignmentByID(assign_id); } else { table = admin.SelectAllAssignments(); } this.gv_assignments.DataSource = table; this.gv_assignments.DataBind(); }