Gets and sets the property OutputKeyPrefix. 
            
            The value, if any, that you want Elastic Transcoder to prepend to the names of all
            files that this job            creates, including output files, thumbnails, and playlists.
            We recommend that you add a            / or some other delimiter to the end of the
             CopyC#.
CopyC#.
            OutputKeyPrefix
 Declaration Syntax
 Declaration Syntax| C# | 
public string OutputKeyPrefix { get; set; }