I've created a simple WCF service inside of WebApplication project.

[ServiceContract(Namespace = "http://my.domain.com/service")]
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class MyService
{
    [OperationContract]
    public string PublishProfile(out string enrollmentId, string registrationCode)
    {
        enrollmentId = null;
        return "Not supported";
    }

built - everything is compiled successfully

After that I've tried to open service in browser, I've got the following error:

Operation 'PublishProfile' in contract 'MyService' specifies an 'out' or 'ref' parameter. Operations with 'out' or 'ref' parameters are not supported

Can't I use 'out' parameters?

What is wrong here?

Thanks