int id = Convert.ToInt32(dataGridView1.CurrentRow.Cells["id"].Value.ToString());
                        var alldata = from a in context.nametabel
                                      where a.id == id
                                      select a;
                        if (alldata.Count() > 0)
                        {
                            nametabel delete= alldata.Single();
                            context.nametabel.DeleteOnSubmit(delete);
                            context.SubmitChanges();
                            select();
                        }