SoapExtension and InvokeAsync

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C#

.NET

SOAP

webservice

Is it possible to attach any SoapExtension to async web services method in .NET. I've tried for normal Invoke method and it worked but I'm unable to get it work with InvokeAsync.

[soapExtensionAttribute]
       [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://xxx.yyy.zzz.com/WebServiceMethod", RequestNamespace = "http://xxx.yyy.zzz.com", ResponseNamespace = "http://xxx.yyy.zzz.com/", Use = System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle = System.Web.Services.Protocols.SoapParameterStyle.Wrapped)]

 public void CallItAsync(string params, object userState)
 {
     if ((this.OperationCompleted == null))
     {
         this.OperationCompleted= new System.Threading.SendOrPostCallback(this.OnOperationCompleted);
     }
     this.InvokeAsync("NameOfMethod", new object[] {
                 params}, this.OperationCompleted, userState);
 }
   [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://xxx.yyy.zzz.com/WebServiceMethod", RequestNamespace = "http://xxx.yyy.zzz.com", ResponseNamespace = "http://xxx.yyy.zzz.com/", Use = System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle = System.Web.Services.Protocols.SoapParameterStyle.Wrapped)]

    [soapExtensionAttribute]
   public string JustiCallIt(string params)
   {
       object[] results = this.Invoke("NameOfMethod", new object[] {
                 params});
       return ((string)(results[0]));
   }

The second and non-async method call extension but first and async never.Thanks in any advice.