How to instantiate MDI parent from other form

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Hi Guys, I just want to ask how to instantiate or call my MDI parent on my Form1. My codes look like this.

Form2 frm2 = new Form2();
frm2.MdiParent = this; --------> this is the one that I want to instantiate on my Form2
frm2.Show();

My problem is I want to instantiate the this part on my syntax on MDIParent on the other form. Thank you guys. Looking forward for the reply.

Posted 5-Sep-13 22:05pm

Member 10095043

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Marvin Ma 6-Sep-13 4:07am

Could you post the code for Form2 please?

Member 10095043 6-Sep-13 4:13am

Yes it is. My problem is I want to reattach my child form to its MDI parent which is the Form1.
Codes Form1:

Codes for detach:
frm2.MdiParent = null; --> This codes is for the detachment of my child form in my MDIPARENT

Codes for reattch: Form2 Codes
//Instantiating Form1
Form1 frm1 = new Form1();
this.MdiParent = frm1; ----> this is the problem whenever I reattach the child form nothing happens.

Member 10095043 6-Sep-13 4:22am

Do you think I can get the value of this on my form1 mdi parent?

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OriginalGriff · Answer 1 · 2013-09-05T23:05:00

Codes for reattch: Form2 Codes

C#

//Instantiating Form1
Form1 frm1 = new Form1();
this.MdiParent = frm1;

this is the problem whenever I reattach the child form nothing happens.

No, it won't.
Because the instance of Form1 that you are "reattaching" to is not the original, and is not even displayed - it is a totally different instance! The keyword new here should give you a clue about this. :laugh:

It's like a car: if you put your mobile phone in the glove box of your car, and sell it to buy a new car, would you expect to find your phone in the new cars glove box?

When you "detach" the form2, either save the Parent instance and use that instance for reattaching, or better still create a events within Form2 which ask the Parent to detach and reattach the form. That way, form2 does not need to know about it's parent.