Why child form is not opening in MDI container C#

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Hi
i have MDI and child form ,But child form does not open inside MDI container in C#.

For MDI form i have set IsmdiContainer : True

For child form i have set IsmdiContainer : False

What I have tried:

private void MnuCalculator_Click(object sender, EventArgs e)
        {
          FrmCalculator child = new FrmCalculator();
            child.MdiParent = this.MdiParent; 
            child.Show();
            
        }

Posted 12-Mar-20 10:42am

pravin9455

Updated 12-Mar-20 10:48am

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Dave Kreskowiak · Accepted Answer · 2020-03-12T10:48:00

You set the MdiParent of the child to the MdiParent of the parent. Your child.MdiParent should just be:

C#

private void MnuCalculator_Click(object sender, EventArgs e)
{
    FrmCalculator child = new FrmCalculator();
    child.MdiParent = this;
    child.Show();
}

Why are you even using MDI to begin with? It's been a dead technology for at least a decade.