The type or namespace name 'Routing' does not exist in the namespace 'System.Web' (are you missing an assembly reference?)
I added web reference System.Web.Routing, but still it showing error.
你需要有.NET 3.5 SP1。
From MSDN :
To simplify development of XML Web service client applications, Visual Studio provides Web references. Web references differ from traditional references and components; instead of referencing a component or a class library installed on the local computer, a Web reference provides access to a resource that is available using an Internet protocol such as SOAP or HTTP. In practice, a Web reference is a generated proxy class that locally represents the exposed functionality of an XML Web service.
A web reference isn't what you want - in simple terms, references allow you to call into DLLs, while web references are used to call web services.
Remove the 'web reference' you've made, and add a normal reference instead.
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