private void btnPurInvoice_Click(object sender, EventArgs e)
{
PurchaseInvoice pI = new PurchaseInvoice();
MainClass.showWindow(pI, this, MDI.ActiveForm);
}
public override void backBtn_Click_1(object sender, EventArgs e)
{
PurchaseInvoice obj = new PurchaseInvoice();
MainClass.showWindow(obj, this, MDI.ActiveForm);
}
private void purchaseBtn_Click(object sender, EventArgs e)
{
PurchaseInvoice p = new PurchaseInvoice();
MainClass.showWindow(p, this, MDI.ActiveForm);
}