Web Services (ASMX 1.1) Performance Guidelines - State Management

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- J.D. Meier, Srinath Vasireddy, Ashish Babbar, and Alex Mackman

Use Session State Only Where It Is Needed

To maintain state between requests, you can use session state in your Web services by setting the EnableSession property of the WebMethod attribute to true, as shown in the following code snippet. By default, session state is disabled.

  YourWebMethod() { ... }

Since you can enable session state at the Web method level, apply this attribute only to those Web methods that need it.

Note Enabling session state pins each session to one thread (to protect session data). Concurrent calls from the same session are serialized once they reach the server, so they have to wait for each other, regardless of the number of CPUs.

Avoid Server Affinity

If you do use session state, in-process session state offers the best performance, but it prevents you from scaling out your solution and operating your Web services in a Web farm. If you need to scale out your Web services, use a remote session state store that can be accessed by all Web servers in the farm.

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