// Create a SoapExtensionAttribute for a SOAP extension that can be
// applied to an XML Web service method.
[AttributeUsage(AttributeTargets.Method)]
public class TraceExtensionAttribute : SoapExtensionAttribute {

    private string myFilename;
    private int myPriority;

    // Set the name of the log file were SOAP messages will be stored.
    public TraceExtensionAttribute() : base()
    {
        myFilename = "C:\\logClient.txt";
    }

    // Return the type of 'TraceExtension' class.
    public override Type ExtensionType
    {
        get
        {
            return typeof(TraceExtension);
        }
    }

    // User can set priority of the 'SoapExtension'.
    public override int Priority 
    {
        get 
        {
            return myPriority;
        }
        set 
        { 
            myPriority = value;
        }
    }

    public string Filename 
    {
        get
        {
            return myFilename;
        }
        set
        {
            myFilename = value;
        }
    }
}