خطـأ بالكود

اخواني الكرام : لدي هذا الكود . قمت بتحويله من لغة فيجول بيك الى سي شارب , لكن لدي بعض الاخطاء , هل من الممكن مساعدتي ف تحويل هذا الكود

       String strPostData = String.Format("user_name={0}&password={1}&Mobileno={2}&message={3}&mtype=sms&ownnumber={4}", Server.UrlEncode(smsUser), Server.UrlEncode(smsPassword), Server.UrlEncode(toMobile), Server.UrlEncode(txtMsg), Server.UrlEncode(smsSender));
        String strResult  = "";



       try
            {

            hwReq = DirectCast(WebRequest.Create("http://www.anywebsite.com"), HttpWebRequest);

            hwReq.Method = "POST";
            hwReq.ContentType = "application/x-www-form-urlencoded";
            hwReq.ContentLength = strPostData.Length;

            Byte arrByteData = ASCIIEncoding.ASCII.GetBytes(strPostData);
            hwReq.GetRequestStream().Write(arrByteData, 0, arrByteData.Length);

            hwRes = DirectCast(hwReq.GetResponse(), HttpWebResponse);
            if (hwRes.StatusCode = HttpStatusCode.OK){

                srdrResponse = new StreamReader(hwRes.GetResponseStream(), Encoding.UTF8);
                String strResponse= srdrResponse.ReadToEnd().Trim();

           switch  (strResponse){
               Case "01":
                        strResult = "success";
                        break;
                    default:
                        strResult = "Error: " + strResponse;

       }      
       }
        catch wex As WebException
            strResult = "Error, " + wex.Message
        Catch ex As Exception
            strResult = "Error, " + ex.Message
        Finally
            hwReq = Nothing
            hwRes = Nothing
       }

        lbresult.Text = "Sent Successfully"
        }
    }