Gets and sets the property AmiVersion. 
            
The version of the Amazon Machine Image (AMI) to use when launching Amazon EC2 instances in the job flow. The following values are valid:
- "latest" (uses the latest AMI)
- The version number of the AMI to use, for example, "2.0"
            If the AMI supports multiple versions of Hadoop (for example, AMI 1.0 supports both
            Hadoop 0.18 and 0.20) you can use the             JobFlowInstancesConfig CopyC#
            parameter             to modify the version of Hadoop from the defaults shown above.
CopyC#
            parameter             to modify the version of Hadoop from the defaults shown above.
            HadoopVersion
For details about the AMI versions currently supported by Amazon Elastic MapReduce, go to AMI Versions Supported in Elastic MapReduce in the Amazon Elastic MapReduce Developer's Guide.
 Declaration Syntax
 Declaration Syntax| C# | 
public string AmiVersion { get; set; }