Making Winfrom into MdiChild Form In C#

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C#

Hi All,

I have the Three winform say Form1,Form2,Form3.In that (Form1)one is mdiparent form and contain menu etc. Other than mdiparent form ,I have one button in Form2 from and when i click on that button ill be opening Form3 form. I have write the code like this

private void xbtnNew_Click(object sender, EventArgs e)
{
Form3 objForm=new Form3();
obForm.ShowDialog();
}

Now i want set the mdiparent to form3. when i write like
objForm.Mdiparent =Form1; ill getting error.


How can i set the mdiparent to form3 ?

Please help urgent

Thanks