Calling a MDI Child's method from the MDI Parent in C# 1 -

in first step login form in mdi container. works well. after login next message form show "out of" mdi container. want show message form in mdi container.

    // mdi code     private void form1_load(object sender, eventargs e)     {         form2 login = new form2();         login.mdiparent = this;         login.show();                 }     // login button code     private void button1_click(object sender, eventargs e)     {         if (textbox1.text == "admin" && textbox2.text == "123")         {             form3 message = new form3();                             this.hide();             message.show();         }     } 

if mean show form inside mdi container do

    message.mdiparent = login.mdiparent;