Identify Session expire in C# .NET

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.NET2.0

C#2.0

C#

.NET

Hi guys , now am in a web service project and new to this concept.I am hosting my service in IIS 5.1 successfully. Now i need to add session time out in my service. After a long surfing on google i found it but still i have some problem in session expire.

If you know explain me in details

My web.config file

<configuration>
  <system.runtime.remoting>
    <application>
      <service>
        <wellknown mode="Singleton" type="HelloWorldObject.Hello, HelloWorldObject" objectUri="SimpleHelloWorld.soap" />
      </service>
      <add name="HelloWorldObject.Properties.Settings.TestingConnectionString"
            connectionString="Data Source=SYS3\SQLEXPRESS;Initial Catalog=Testing;Integrated Security=True"
            providerName="System.Data.SqlClient" />
    </application>
  </system.runtime.remoting>
  <system.web>
     <sessionState timeout="1"></sessionState>
  </system.web>
 </configuration>

And another thing is, i need to notify my client when the time session expire how can i achieve this....

Thanks in advance
ganesh_IT