title: Specify environmental variables as commandline parameter in a debug session of VisualStudio C#
body: <p>I want to use an environment variable as a commandline parameter in a debug session.
  So Project Properties->Debug->Command line arguments: %TEMP% gives me not the temp path as a parameter rather than the string "%TEMP%".</p>
  
  <p>Of course I could resolve the environment variable to a path programmatically or copy past the correct path.
  But I want just to know, if an envvariable works and when, how it works?!</p>
  
  <p>Does someone know how I can specify an envvar as a commandline parameter in VS debug commandline arguments?</p>