How to create a MDI Child Form in VB.NET (Runtime)

MDI stands for Multiple Document Interface applications that allow users to work with multiple documents by opening more than one document at a time. Whereas, a Single Document Interface (SDI) application can manipulate only one document at a time.
The MDI applications act as the parent and child relationship in a form. A parent form is a container that contains child forms, while child forms can be multiple to display different modules in a parent form.
VB.NET has following rules for creating a form as an MDI form.
MidParent: The MidParent property is used to set a parent form to a child form.
ActiveMdiChild: The ActiveMdiChild property is used to get the reference of the current child form.
IsMdiContainer: The IsMdiContainer property set a Boolean value to True that represents the creation of a form as an MDI form.
LayoutMdi(): The LayoutMdi() method is used to arrange the child forms in the parent or main form.
Controls: It is used to get the reference of control from the child form.

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