MdiContainer form not opening

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I've 2 forms named as 'mdfi' & 'form1',i want to make 'mdfi' form as MdiContainer by code from 'form1' i tried a lot do with this code but the programs close when i run. Here the code am trying

private void Form1_Deactivate(object sender, EventArgs e)
{
this.TopMost = false;
Mdfi newMDIChild = new Mdfi();
newMDIChild.IsMdiContainer = true;
this.MdiParent = newMDIChild;
newMDIChild.Show();

Posted 7-Feb-14 2:45am

jeffingeorge

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S Houghtelin · Answer 1 · 2014-02-07T04:27:00

You can't make the parent form from a child form the parent need to come before the child. Use this instead.

C#

private void buttonFormActivator_Click(object sender, EventArgs e)
{
    //Create parent and child forms    
    Form MyMdiParentForm = new Form();
    Form MyNewMdiChildForm = new Form();

    //Make Parent form an MDI container
    MyMdiParentForm.IsMdiContainer = true;
    // Set the Parent Form as the parent of the Child Form.
    MyNewMdiChildForm.MdiParent = MyMdiParentForm;
    //Display the Parent form
    MyMdiParentForm.Show();
    // Display the child form.
    MyNewMdiChildForm.Show();

    // Hide your initial form, 
    // take care to write a method
    // to close this form when you are
    // done with the application. (Like a while app active loop)
    this.Hide();
}