Mdi Child to normal form and vice versa

[subramaninan]

Hi Friends

 

I'm a beginner to .NET C#, and i'm working in a project where my first MDI Child opens a normal form which is not a child form and get a value in that and returns it to the second MDI Child form.

 

The Flow is

Parent(Form 1) --> Child 1(Form 2) ---> Form 3 ----> Child 2(Form 4)

 

I'm struck'd in third level of opening the child 2 form in MDI container from From 3.

 

I tried with the below code in the Form3 button click event and get an exception.

 

Form4 sr = new Form4(text);

sr.MdiParent = Form1.ActiveForm;

sr.Show();

 

And the error was

 

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

Parameter name: value

 

Plz help in getting out from this.

 

Thanks in advance

Subramanian.K.S

[PlausiblyDamp]

Shouldn't the MDIParent be form1 rather than form1.ActiveForm?