Rename all instances of a variable in a method by renaming the variable just once at the method signature in Visual Studio 2013.

1. Highlight the variable.
   
2. Type the new name. Just the last letter of the new name will be underlined with a little red accent.
   
3. Click on the little red accent. A menu should appear giving you an option to "Rename 'alice' to 'bob'" so to speak.
   
4. The act will occur!