private void but_add_Click(object sender, EventArgs e)
{
Database db = new Database();
Plate plate = new Plate();
plate.part_name_ = text_part.Text;
plate.thick_ = combo_thick.Text;
plate.mat_ = comboBox3.Text;
db.add_plate(plate);
Autodesk.AutoCAD.ApplicationServices.Application.ShowAlertDialog("Add plate OK.");
}
public void add_plate(Plate pl)
{
plates_.Add(pl);
}