Asynchronous WCF operation call doesn't works

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WCF

The book I am reading says I can call a operation in async fashion without doing anything in the service side.

So, I call a WCF operation using ChannelFactory in asynchronous way. I created a WCF service and have not made any changes to the sample GetData operation that VS creates apart from adding a File.ApendAllText. In the client side, I have both synchronous and asynchronous operation contracts defined. Here is how it looks in proxy class:

[System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0")]
[System.ServiceModel.ServiceContractAttribute(ConfigurationName="ServiceReference.IService1")]
public interface IService1 {
        
[System.ServiceModel.OperationContractAttribute(Action="http://tempuri.org/IService1/GetData", ReplyAction="http://tempuri.org/IService1/GetDataResponse")]
SampleClient.ServiceReference.GetDataResponse GetData(SampleClient.ServiceReference.GetDataRequest request);
        
[System.ServiceModel.OperationContractAttribute(AsyncPattern=true, Action="http://tempuri.org/IService1/GetData", ReplyAction="http://tempuri.org/IService1/GetDataResponse")]
System.IAsyncResult BeginGetData(SampleClient.ServiceReference.GetDataRequest request, System.AsyncCallback callback, object asyncState);
        
SampleClient.ServiceReference.GetDataResponse EndGetData(System.IAsyncResult result);
}

I have the following code in the client side (console application):

ChannelFactory<IService1Channel> sampleServiceChannel = new ChannelFactory<IService1Channel>(new BasicHttpBinding(), new EndpointAddress("http://localhost:57632/Service1.svc"));

IService1 sampleService = sampleServiceChannel.CreateChannel();

Console.WriteLine(sampleService.GetData(new GetDataRequest(3)).GetDataResult);

sampleService.BeginGetData(
	new GetDataRequest(2),
	
	delegate(IAsyncResult asyncResult)
        {
	Console.WriteLine(sampleService.EndGetData(asyncResult).GetDataResult);
        Console.Read();
        },
	
	null);

I think I am missing something here. Can anyone point out what it is?

There is no error but operation does not gets called the async way. With same Channel, I can call the operation synchronously.