/// <summary>
 /// Gets the entity state (Etag) version of the named value specified by its
 /// identifier.
 /// </summary>
 /// <param name='operations'>
 /// The operations group for this extension method.
 /// </param>
 /// <param name='resourceGroupName'>
 /// The name of the resource group.
 /// </param>
 /// <param name='serviceName'>
 /// The name of the API Management service.
 /// </param>
 /// <param name='namedValueId'>
 /// Identifier of the NamedValue.
 /// </param>
 /// <param name='cancellationToken'>
 /// The cancellation token.
 /// </param>
 public static async Task <NamedValueGetEntityTagHeaders> GetEntityTagAsync(this INamedValueOperations operations, string resourceGroupName, string serviceName, string namedValueId, CancellationToken cancellationToken = default(CancellationToken))
 {
     using (var _result = await operations.GetEntityTagWithHttpMessagesAsync(resourceGroupName, serviceName, namedValueId, null, cancellationToken).ConfigureAwait(false))
     {
         return(_result.Headers);
     }
 }