Gets and sets the property Key. 
            
             The name of the file to transcode. Elsewhere in the body of the JSON block is the
            the ID            of the pipeline to use for processing the job. The  CopyC#
            object in            that pipeline tells Elastic Transcoder which Amazon S3 bucket
            to get the file from.
CopyC#
            object in            that pipeline tells Elastic Transcoder which Amazon S3 bucket
            to get the file from. 
            InputBucket
            If the file name includes a prefix, such as  CopyC#, include
            the            prefix in the key. If the file isn't in the specified bucket, Elastic
            Transcoder returns an error.
CopyC#, include
            the            prefix in the key. If the file isn't in the specified bucket, Elastic
            Transcoder returns an error.
            cooking/lasagna.mpg
 Declaration Syntax
 Declaration Syntax| C# | 
public string Key { get; set; }