private void btnNuevo_Click(object sender, EventArgs e)
{
Form_compras.folio = "0";
Form_compras new_compra = new Form_compras();
new_compra.Owner = this;
new_compra.Show();
}
private void dtCompras_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)
{
int selectedrowindex = dtCompras.SelectedCells[0].RowIndex;
DataGridViewRow selectedRow = dtCompras.Rows[selectedrowindex];
string codigo = Convert.ToString(selectedRow.Cells["documento"].Value);
Form_compras.folio = codigo;
Form_compras new_compra = new Form_compras();
new_compra.Owner = this;
new_compra.Show();
}