public void CapNhatTrangThaiTK() { QuanLyBanHangQuaMangDataContext dbs = new QuanLyBanHangQuaMangDataContext(Class1.connstr); a = Boolean.Parse(dbs.F_LayTinhTrangTK(Class1.username).ToString()); if (a == true) { try { dbs.SP_CapNhatTrangThaiTaiKhoan(Class1.username); a = false; } catch (Exception er) { MessageBox.Show(er.Message); } } }