private void cargarCargos()
 {
     cbCargo.DataSource    = NCargos.Mostrar();
     cbCargo.ValueMember   = "CodigoC";
     cbCargo.DisplayMember = "Cargo";
 }
 private void Mostrar()
 {
     this.dgvRegistros.DataSource = NCargos.Mostrar();
     this.OcultarColumnas();
     lblTotal.Text = "Total de Registros: " + Convert.ToString(dgvRegistros.Rows.Count);
 }