When you create a new coded step (or customize a step in code) while using the VS plug-in, the description always starts with @" . Two examples:
[ParentTest1_CodedStep] : @"New Coded Step
[ParentTest1_CodedStep1] : @"Click 'SupportUsLink'

Note the @" characters at the front of the coded step description. These characters should not be there. They do not show when using standalone.

To make it even more confusing, when you open the same project in standalone (after adding the coded step) then click "View Entire Code Behind File" the descriptions of all coded steps suddenly "magically" changes and the @" characters are removed.