private void checkBoxMultiple_CheckedChanged(object sender, EventArgs e)
{
if (!checkBoxMultiple.Checked) return;
if (form2 == null)
{
form2 = new Multiple_Parts(this);
form2.Show();
Console.WriteLine("Multiple Parts is null");
}
else
form2.Show();
Console.WriteLine("Opening multiple parts form");
}
public Borrow()
{
InitializeComponent();
Grade.Value = keepGrade;
form2 = new Multiple_Parts(this);
}