public void printfs(object sender, Ext.Net.DirectEventArgs e) { bindUser(); RowSelectionModel sm = GridPanel1.GetSelectionModel() as RowSelectionModel; List <string> ids = new List <string>(); ids = sm.SelectedRows.Select(row => row.RecordID).ToList <string>(); List <EB_Student> namelist = (from people in stulist where people.Id == ids[0] select people).ToList <EB_Student>(); X.Call("SelectNum", namelist); }