private bool isExist(string CustomerName, double ID) { DataTable d = _NguoidungDAL.GetTenNguoiDungDynamic(" Ten_Dangnhap=N'" + CustomerName + "' and nguoitao=" + _user.UserID.ToString() + " and Ma_Nguoidung<>" + ID.ToString(), null).Tables[0]; if (d.Rows.Count == 0) { return(false); } else { return(true); } }