How to access ASP.NET session in Silverlight?

This explain how to access ASP.NET Session in Silverlight

To begin with Silverlight cannot access Session of ASP.NET as Silverlight is on client side and ASP.NET is server side and there is no direct communications between both.

Now, the question is how to access ASP.NET session state from Silverlight application. Here is an approach how to accomplish this, let us examine the steps to achieve this:

1) Create a service contract which exposes a session query method using WCF as we consume this from Silverlight as Silverlight cannot directly talk to ASP.NET.

[ServiceContract]
public interface ISessionService
{
[OperationContract]
string SpeakToASPNETSession(string str)
}

2) To implement this service contract, create a WCF service class applying AspNetCompatibilityRequirementsAttribute.

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed]
public class WcfServiceToSession: ISessionService
{
public string SpeakToASPNETSession(string str)
{
return HttpContext.Current.Session[str] as string;
}
}
3) Finally, we need to enable the aspNetCompatibility function in the Web.config by adding the following line:

<serviceHostingEnvironment aspNetCompatibilityEnabled="true" />