From this dialog, it is possible to modify the number of spaces that each tab will insert into your source code and to manage several other elements of your editing environment. Within this dialog you see settings that are common for all text editing environments, as well as the ability to customize specific settings for specific languages. For example the section specific to Visual Basic includes settings that allow for word wrapping and line numbers. One little-known but useful capability of the text editor is line numbering. Checking the Line numbers check box will cause the editor to number all lines, which provides an easy way to unambiguously reference lines of code.
Visual Studio also provides a visual indicator so you can track your changes as you edit. Enabling the Track changes setting under the Text Editor options causes Visual Studio to provide a colored indicator in places where you have modified a file. This indicator appears as a colored bar at the left margin of your display. It shows which portions of a source file have been recently edited and whether those changes have been saved to disk.
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