private void SearchDocumento(object sender, EventArgs e)
        {
            var proveedor = new SearchProvedorPopUp();

            if (proveedor.DialogResult == DialogResult.OK)
            {
                ProvedorId     = proveedor._selectedProvedor.Id;
                txtNumero.Text = proveedor._selectedProvedor.Nombre;
            }
        }
        private void btnSearch_Click(object sender, EventArgs e)
        {
            var provedorDialog = new SearchProvedorPopUp();

            if (provedorDialog.ShowDialog() == DialogResult.OK)
            {
                ProveedorId      = provedorDialog._selectedProvedor.Id;
                txtProvedor.Text = provedorDialog._selectedProvedor.Nombre;
            }
            else
            {
                ProveedorId      = 0;
                txtProvedor.Text = "";
            }
        }