Form that was specified to be the MdiParent for this form is not an MdiContainer

Question

I was working on an inventory software and suddenly came to know that I need some main form through which I should open all the other forms, so I created one named frmMainPanel and use a menu strip to link it to another I am successful in linking them but they are opening outside the main form, I use following code to link them

Linking frmSaleInvoice form using:

frmSaleInvoice childForm = new frmSaleInvoice();
cs.show()

now i realize i should make them child to the main form so i tried that using following code:

frmSaleInvoice childForm = new frmSaleInvoice();

childForm.MdiParent = this;
childForm.Show();

but it says **" Form that was specified to be the MdiParent for this form is not an MdiContainer."**

can any one help me out wher i am mistaking and how could i make a form named frmSaleInvoice to child of other form named frmMainPanel

Solution 1

The Mdi parent must have it's IsMdiContainer property set to True. You can set this property at design time in your frmMainPanel form.

Solution 2

You should set the IsMdiContainer = true for the parent form.