Change line length in Visual Studio 2010

If one uses Resharper:

Resharper -> Options -> Code Editing -> C# -> Formatting Style -> Line Breaks and Wrapping -> Right margin (columns)

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Edited for new version of Resharper (2018.3)

Resharper -> Options -> Code Editing -> C# -> Formatting Style -> Line Breaks and Wrapping -> General -> Hard wrap at

Details: The officical Resharper help

For me, I had to apply Patrick's suggestion, as well as the following:

• Tools
  • Options
    • Text Editor
      • HTML
        • Formatting
          • Tag Wrapping
            • Wrap tags when exceeding specified length (uncheck, or adjust length)

This setting can be adjusted by opening Tools, Options, Text Editor, C#, Formatting, Wrapping

In the view you have a setting called "Leave block on single line". If you check it, code will stay on one line.

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Edit: The above option will only work for blocks though. There's no way using vanilla Visual Studio to change the wrapping for "any line" (and I'm not aware of any registry hack unfortunately).

Using Resharper, you can set the number of columns that the text editor should consider when wrapping lines, and you can also determine if lines should or should not break. Details can be found in this answer by hmemcpy.