/// <summary>
 /// Modify properties of virtual networks.
 /// </summary>
 /// <param name='operations'>
 /// The operations group for this extension method.
 /// </param>
 /// <param name='resourceGroupName'>
 /// The name of the resource group.
 /// </param>
 /// <param name='labName'>
 /// The name of the lab.
 /// </param>
 /// <param name='name'>
 /// The name of the virtual network.
 /// </param>
 /// <param name='virtualNetwork'>
 /// A virtual network.
 /// </param>
 /// <param name='cancellationToken'>
 /// The cancellation token.
 /// </param>
 public static async Task <VirtualNetwork> UpdateAsync(this IVirtualNetworksOperations operations, string resourceGroupName, string labName, string name, VirtualNetworkFragment virtualNetwork, CancellationToken cancellationToken = default(CancellationToken))
 {
     using (var _result = await operations.UpdateWithHttpMessagesAsync(resourceGroupName, labName, name, virtualNetwork, null, cancellationToken).ConfigureAwait(false))
     {
         return(_result.Body);
     }
 }