Gets and sets the property InputKey. 
            
             The name of the .png or .jpg file that you want to use for the watermark. To determine
                       which Amazon S3 bucket contains the specified file, Elastic Transcoder
            checks the pipeline specified by                 CopyC#; the
CopyC#; the Pipeline
 CopyC# object in that pipeline            identifies the bucket.
CopyC# object in that pipeline            identifies the bucket.
            Input
            Bucket
If the file name includes a prefix, for example, logos/128x64.png, include the prefix in the key. If the file isn't in the specified bucket, Elastic Transcoder returns an error.
 Declaration Syntax
 Declaration Syntax| C# | 
public string InputKey { get; set; }