private void mnuAddSupplier_Click(object sender, EventArgs e)
{
if (supForm != null)
{
supForm.Show();
}
else
{
supForm = new SupplierForm();
supForm.MdiParent = clsFormProvider.mainF;
supForm.Show();
supForm.FormClosing += supForm_FormClosing;
}
}
public void userForm_FormClosing(object sender, FormClosingEventArgs e)
{
supForm = null;
}