Sets the Region the Availablity Zone is in
            
 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 AvailabilityZone WithRegionName( string regionName )
 Parameters
 Parameters- regionName (String)
- Name of the region.
 Return Value
 Return Valuethis instance