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This means the web method returns immediately and closes the connection The client doesn t need to spend any time waiting However, one-way methods have a few drawbacks Namely, the web method can t provide a return value or use a ref or out parameter Similarly, if the web method throws an unhandled exception, it won t be propagated back to the client..

To create a fire-and-forget XML web service method, you need to apply a SoapDocumentMethod attribute to the appropriate web method and set the OneWay property to true, as shown here: [SoapDocumentMethod(OneWay = true)] [WebMethod()] public DataSet GetEmployees() { .. } The client doesn t need to take any special steps to call a one-way method asynchronously Instead, the method always returns immediately Of course, you might not want to use one-way methods The most important limitation is that you can t return any information For example, a common asynchronous server-side pattern is for the server to return some sort of unique, automatically generated ticket to the client when the client submits a request The client can then submit this ticket to other methods to check the status or retrieve the results.

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This will be translated into the correct language by default, when accessed The raw, untranslated version of Occasionally, it s necessary to use the same display name for everyone, regardless of translation This is particularly useful when storing it away in the cache or database for later access, especially if it ll be translated at a later point in time..

With a one-way method, there s no way to return a ticket to the client or notify the client if an error occurs Another problem is that one-way methods still use ASPNET worker threads If the task is extremely long and there are many ongoing tasks, other clients might not be able to submit new requests, which is far from ideal The only practical way to deal with long-running, asynchronous tasks in a heavily trafficked website is to combine web services with another NET technology remoting For example, you could create an ordinary, synchronous web method that returns a ticket and then calls a method in a server-side component using remoting The remoting component could then begin its processing task asynchronously This technique of using a web service as a front-end to a full-fledged, continuously running server-side component is a more complex hallmark of distributed design.

Unary minus and plus Logical and bitwise negation Multiplication, division, remainder Addition, subtraction Left and right bitwise shifts Comparison Equality and inequality

To learn more, you may want to consult a dedicated book about distributed programming, such as Microsoft NET Distributed Applications (Microsoft Press, 2003) or a book about NET remoting, such as Advanced NET Remoting (Apress, 2002) Of course, if you don t need this flexibility, you re better off avoiding it completely, because it introduces significant complexity and extra work..

In an ideal world, you could treat a web service as a class library of functionality and not worry about coding user authentication or security logic. However, to create subscription-based or micropayment web services, you need to determine who is using it. And even if you aren t selling your logic to an audience of eager web developers, you may still need to use authentication to protect sensitive data and lock out malicious users, especially if your web service is exposed over the Internet. You can use some of the same techniques you use to protect web pages to defend your web services. For example, you can use IIS to enforce SSL (just direct your clients to a web service URL starting with https://). You can also use IIS to apply Windows authentication, although you need to apply a few additional steps, as you ll learn in the next section. Finally, you can create your own custom authentication system using SOAP headers.

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