如何在Windows Phone 8.1中动态传递参数

Question

任何人都指导我在c＃中动态传递参数。我已经分配了两个文本框，其中必须将这些文本框中的用户输入作为参数传递。如果我传递静态参数，我将收到服务器的响应。

这是我的编码。

        string AuthServiceUri = "my url";
        HttpWebRequest spAuthReq = HttpWebRequest.Create(AuthServiceUri) as HttpWebRequest; 
        spAuthReq.ContentType = "application/json"; 
        spAuthReq.Method = "POST"; 
        spAuthReq.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), spAuthReq);

    }
    void GetRequestStreamCallback(IAsyncResult callbackResult) 
    {

        HttpWebRequest myRequest = (HttpWebRequest)callbackResult.AsyncState; 
        Stream postStream = myRequest.EndGetRequestStream(callbackResult);
        string postData = "id=1234567890&keyword=otp&message=8320926"; //passing static parameters & here i need to pass the text boxes data in id and message field.
        byte[] byteArray = Encoding.UTF8.GetBytes(postData); 
        postStream.Write(byteArray, 0, byteArray.Length); 
        postStream.Dispose(); 
        myRequest.BeginGetResponse(new AsyncCallback(GetResponsetStreamCallback), myRequest);

    } 

非常感谢您的帮助。