Retrieve Global Optionset list of values with C#

This is a method that you can use to retrieve a Global Optionset list of values with C#, it works for CRM 2011, 2013 and 2015.

/// <summary>
/// Method to retrieve global optionset metadata values
/// </summary>
/// <param name="_serviceProxy">CRM Service instance</param>
/// <param name="_globalOptionSetName">Global Optionset name</param>
/// <returns>Returns the global optionset metadata values</returns>
private OptionMetadata[] GetGlobalOptionsetValues(OrganizationServiceProxy _serviceProxy, string _globalOptionSetName)
{
 OptionMetadata[] result = null;

 // Use the RetrieveOptionSetRequest message to retrieve  
 // a global option set by it's name.
 RetrieveOptionSetRequest retrieveOptionSetRequest = new RetrieveOptionSetRequest(){ Name = _globalOptionSetName };

 // Execute the request.
 RetrieveOptionSetResponse retrieveOptionSetResponse = (RetrieveOptionSetResponse)_serviceProxy.Execute(retrieveOptionSetRequest);            

 // Access the retrieved OptionSetMetadata.
 OptionSetMetadata retrievedOptionSetMetadata = (OptionSetMetadata)retrieveOptionSetResponse.OptionSetMetadata;

 // Get the current options list for the retrieved attribute.
 result = retrievedOptionSetMetadata.Options.ToArray();

 return result;
}