namespace System.ServiceModel
{
    public abstract class ClientBase<TChannel> : IAsyncDisposable, IDisposable, ICommunicationObject
        where TChannel, class
    {
        protected delegate IAsyncResult BeginOperationDelegate(object[] inValues, AsyncCallback asyncCallback, object state);
        {
            public virtual IAsyncResult EndInvoke(IAsyncResult result);
        }
    }
}