private void btnNuevo_Click(object sender, EventArgs e)
        {
            FrmOperaciones agregar = new FrmOperaciones();

            agregar.FormClosed += new FormClosedEventHandler(actualizar_FormClosed);
            agregar.Text        = "Nuevo";
            agregar.ShowDialog();
        }
        private void btnVerModificar_Click(object sender, EventArgs e)
        {
            int            id        = Convert.ToInt32(dgvCorrespondencia.CurrentRow.Cells[0].Value);
            FrmOperaciones modificar = new FrmOperaciones(id);

            modificar.FormClosed += new FormClosedEventHandler(actualizar_FormClosed);
            modificar.Text        = "Ver/Modificar";
            modificar.ShowDialog();
        }