How to access next Page in class file

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C#

Hai i am using silverlight 4 .how to go next page in silverlight Class not for Xmal page i ma using the class , So i dont know how to go for next page in class file Below is my code

 public void GetResponseCallback(IAsyncResult asynchronousResult)
        {
            HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
            HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
            Stream streamResponse = response.GetResponseStream();
            StreamReader streamRead = new StreamReader(streamResponse);
            string responseString = streamRead.ReadToEnd();
            MemoryStream ResMs = new MemoryStream(Encoding.UTF8.GetBytes(responseString));
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(mResponse));
            mResponse _ResLogIn = (mResponse)ser.ReadObject(ResMs);
            if (_ResLogIn.Code == "1")
            {
                
                
              // Hear only i need to access  next Page 
//this one of the Class file (vm.login.cs)
//if _ResLogIn.Code to for next Page Please help me
            }
            else
            {
                Deployment.Current.Dispatcher.BeginInvoke(() =>
                {
                    MessageBox.Show("InValied UserName and PassWord");
                    return;
                });
            }

            streamResponse.Close();
            streamRead.Close();
            response.Close();
        }
    }