Sets an ETag to be matched as a pre-condition for copying the source object,
            otherwise returns a PreconditionFailed.
            
 Declaration Syntax
 Declaration Syntax| C# | 
[ObsoleteAttribute("The With methods are obsolete and will be removed in version 2 of the AWS SDK for .NET. See http://aws.amazon.com/sdkfornet/#version2 for more information.")] public CopyObjectRequest WithETagToMatch( string etagToMatch )
 Parameters
 Parameters- etagToMatch (String)
- The ETag value to be matched
 Return Value
 Return Valuethis instance
 Remarks
 Remarks
            Copies the object if its entity tag (ETag) matches 
            the specified tag; otherwise return a 412 (precondition failed).
            Constraints: This property can be used with IfUnmodifiedSince,
            but cannot be used with other conditional copy properties.