Sets the TopicArn property
            
 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 Snapshot WithTopicArn( string topicArn )
 Parameters
 Parameters- topicArn (String)
- The value to set for the TopicArn property
 Return Value
 Return Valuethis instance