如何从一个mdichild转到另一个mdichild，所有这些都在同一个mdicontainer中打开

问题描述

"form1是一个mdiContainer，form2在form1中打开.我想从MdiParent为form1的form2移到form3."

"form1 is a mdiContainer and form2 is open in the form1. i want to move from form2 to form3 whose MdiParent is form1."

private void button1_Click(object sender, EventArgs e)
       {
Form3 fm3 = new Form3();//Error: Form that was specified to be the MdiParent for 
fm3.MdiParent = this;   //this form is no an Mdicontainer.
fm3.Show();             //How can remove this error.
       }

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