Gets and sets the property EnvironmentName.
The name of the environment to update. If no environment with this name
exists, AWS Elastic Beanstalk returns an 
CopyC#
error.
InvalidParameterValue
Condition: You must specify either this or an EnvironmentId, or both.
If you do not specify either, AWS Elastic Beanstalk returns CopyC#
error.
MissingRequiredParameter
Declaration Syntax| C# |
public string EnvironmentName { get; set; }