Mdi child problems

It solved the problem. Many thanks Carl

Please the Check the Following Code, using System.Windows.Forms; using System; using System.Drawing; namespace MDIApp { public class MdiForm : Form { public MdiForm() { this.IsMdiContainer=true; Child1 c1= new Child1(this); c1.MdiParent = this; c1.Show(); } } public class Child1 : Form { public Child1(Form MdiForm) { this.Text="I am First Child"; Child2 c2=new Child2(); c2.MdiParent=MdiForm; c2.Show(); } } public class Child2 : Form { public Child2() { this.Text="I am Second Child"; } } public class Runner { public static void Main() { Application.Run(new MdiForm()); } } }