int id = Convert.ToInt32(dataGridView1.CurrentRow.Cells["id"].Value.ToString());
                var alldata = from user in context.nametabel
                              where user.id == id
                              select user;
                if (alldata.Count() == 1)
                {
                    nametabel  userupdate = alldata.Single();
                    userupdate.name= txtname.Text.Trim();
                    userupdate.hamrah = Convert.ToInt64(txthamrah.Text.Trim());
                    

                };
                context.SubmitChanges();