public DataTable KhachGiaoDich(string makhach, char loai) { try { using (QLCuaHangDataContext cuahang = new QLCuaHangDataContext()) { DataTable dt = new DataTable(); dt.Columns.Add("MaKhach"); dt.Columns.Add("TenKhach"); dt.Columns.Add("SDT"); dt.Columns.Add("DiaChi"); dt.Columns.Add("GhiChuKhach"); dt.Columns.Add("MaNX"); dt.Columns.Add("Ngay"); dt.Columns["Ngay"].DataType = typeof(DateTime); dt.Columns.Add("GhiChuNX"); DataRow dr; foreach (var kgd in cuahang.SP_XemKhachGiaoDich(makhach, loai)) { dr = dt.NewRow(); dr["MaKhach"] = kgd.MaKhach; dr["TenKhach"] = kgd.TenKhach; dr["SDT"] = kgd.SDT; dr["DiaChi"] = kgd.DiaChi; dr["GhiChuKhach"] = kgd.GhiChuKhach; dr["MaNX"] = kgd.MaNX; if (kgd.Ngay != null) { dr["Ngay"] = kgd.Ngay; } else { dr["Ngay"] = DBNull.Value; } dr["GhiChuNX"] = kgd.GhiChuNX; dt.Rows.Add(dr); } return(dt); } } catch (Exception ex) { myme.ShowError(ex); return(null); } }