In this tutorial, I will teach you how to add a form inside the form using C#. This method has the ability to change the display and how the form works into an MDI parent form. Then, you will see that the form displays a sunken client area with a raised border, once you set this property into true

. And in the client area, it is where all the MDI child forms placed to the parent form are displayed.

Creating Application

Step 1

Open Microsoft Visual Studio 2015 and create a new windows form application.

Step 2

Do the Form just like this.

Step 3

Add another Form.

Step 4

Go to Form1 and open the code view. In the code view create a method for closing and adding the form inside the form.

1. private
   
   void
   
   closeChildForm(
   
   )
   
2. {
   
3. foreach
   
   (
   
   Form frm in
   
   this
   
   .
   
   MdiChildren
   
   )
   
4. {
   
5. frm.
   
   Close
   
   (
   
   )
   
   ;
   
6. }
   
7. }
   
8. 
   
9. private
   
   void
   
   showFrm(
   
   Form frm)
   
10. {
    
11. this
    
    .
    
    IsMdiContainer
    
    =
    
    true
    
    ;
    
12. frm.
    
    MdiParent
    
    =
    
    this
    
    ;
    
13. frm.
    
    Show
    
    (
    
    )
    
    ;
    
14. }
    

Step 5

Double click the “Add Form” button and call the method that you have created to execute when the button is clicked.

1. private
   
   void
   
   button1_Click(
   
   object
   
   sender, EventArgs e)
   
2. {
   
3. closeChildForm(
   
   )
   
   ;
   
4. Form frm =
   
   new
   
   Form2(
   
   )
   
   ;
   
5. showFrm(
   
   frm)
   
   ;
   
6. 
   
7. }
   

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