private void abastecimientosToolStripMenuItem_Click(object sender, EventArgs e)
{
OperationWindow.operation_type = 1;
OperationWindow ow = new OperationWindow();
ow.ShowDialog();
}
private void historialToolStripMenuItem_Click(object sender, EventArgs e)
{
OperationWindow.operation_type = 2;
OperationWindow ow = new OperationWindow();
ow.ShowDialog();
}