If you have a messy markup page (ASPX, ASP, HTML, XML, etc.) that’s hard to read, just hit Ctrl-K then Ctrl-D and Visual Studio will instantly format it with carriage returns, nested tabs, etc.

For example, this:

<?xml version="1.0" encoding="utf-8" ?><myclass><myfield1><myfield2></myField2></myField1></myClass>

Becomes this:

<?xml version="1.0" encoding="utf-8" ?>
<myclass>
  <myfield1>
    <myfield2></myField2>
  </myField1>
</myClass>