private void ReporteDeMaterialesToolStripMenuItem_Click(object sender, EventArgs e)
        {
            rptMateriales ver = new rptMateriales();

            ver.StartPosition = FormStartPosition.CenterScreen;
            ver.Show();
        }
 private void ImprimirButton_Click(object sender, EventArgs e)
 {
     if (MaterialesDataGridView.RowCount == 0)
     {
         MessageBox.Show("No se puede imprimir");
         return;
     }
     else
     {
         rptMateriales m = new rptMateriales(Lista);
         m.ShowDialog();
     }
 }