How to: View Multiple Lines in the Windows Forms TextBox Control
By default, the Windows Forms TextBox control displays a single line of text and does not display scroll bars. If the text is longer than the available space, only part of the text is visible. You can change this default behavior by setting the Multiline, WordWrap, and ScrollBars properties to appropriate values.
To display a carriage return in the TextBox control
To view multiple lines in the TextBox control
Set the ScrollBars property to an appropriate value.
Use this value if the text will be a paragraph that almost always fits the control. The user can use the mouse pointer to move around inside the control if the text is too long to display all at once.
Use this value if you want to display a list of lines, some of which may be longer than the width of the TextBox control.
Use this value if the list may be longer than the height of the control.
Set the WordWrap property to an appropriate value.
TextBox Control Overview (Windows Forms)
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TextBox Control (Windows Forms)