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New Event-Based Model For Asynchronous WebMethod Calls

ASP.NET Web Services supports a new model for asynchronous WebMethod calls. Use the event-based model to asynchronously call your Web services. This sample shows how to define your callback function and add it to your proxy class' event handler. When the method call returns, your callback function will be called.

//First implement the HelloWorldCompleted method using the following signature: //public void HelloWorldCompleted(object sender, HelloWorldCompletedEventArgs args) //Create the Web service HelloWorldWaitService service = new HelloWorldWaitService(); //Add our callback function to the event handler service.HelloWorldCompleted += this.HelloWorldCompleted; //Call the Web service asynchronously service.HelloWorldAsync("first call"); //when the Web service call returns the HelloWorldCompleted method will be called 'First implement the HelloWorldCompleted method using the following signature: 'public void HelloWorldCompleted(object sender, HelloWorldCompletedEventArgs args) 'Create the Web service Dim service As New HelloWorldWaitService() 'Add our callback function to the event handler AddHandler service.HelloWorldCompleted, AddressOf HelloWorldCompleted 'Call the Web service asynchronously service.HelloWorldAsync("first call") 'when the Web service call returns the HelloWorldCompleted method will be called