Web Reference: May 7, 2025 · Learn how to use Visual Studio to create a Multiple-Document Interface (MDI) child form that displays a RichTextBox control. The acronym MDI stands for Multi Document Interface. If you have ever used Microsoft Word or Excel the chances are you have used a multi-document interface. Multi-document interfaces consist of a parent form (also called a container) which contains other forms. For example, when more than one document is open in some versions of Microsoft Word, eac... The Form that you have been using so far are single form. In Visual Basic you can use Multiple Document Interface (MDI) Form, a form that can contain multiple forms.
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