C # HTTP request get,post with retry parameters

 Public classWebhttp {/// <summary>        ///GET request with retry/// </summary>        /// <param name= "Url" ></param>        /// <param name= "Postdatastr" ></param>        /// <param name= "sum" ></param>        /// <returns></returns>         Public Static stringHttpGet (stringUrlstringPOSTDATASTR,intsum) {            stringtemp=NULL;  for(inti =0; i < sum; i++)            {                if(string. IsNullOrEmpty (temp) | |string. IsNullOrEmpty (temp. Trim ())) {Temp=HttpGet (URL, POSTDATASTR); }                Else {                     Break; }            }            returntemp; }        /// <summary>        ///POST request with retry/// </summary>        /// <param name= "Url" ></param>        /// <param name= "Postdatastr" ></param>        /// <param name= "sum" ></param>        /// <returns></returns>         Public Static stringHttpPost (stringUrlstringPOSTDATASTR,intsum) {            stringtemp =NULL;  for(inti =0; i < sum; i++)            {                if(string. IsNullOrEmpty (temp) | |string. IsNullOrEmpty (temp. Trim ())) {Temp=HttpPost (URL, POSTDATASTR); }                Else                {                     Break; }            }            returntemp; }        /// <summary>        ///GET request and get result/// </summary>         Public Static stringHttpGet (stringUrlstringpostdatastr) {            Try{HttpWebRequest Request= (HttpWebRequest) webrequest.create (Url + (Postdatastr = =""?"":"?") +postdatastr); Request. Method="GET"; Request. ContentType="Text/html;charset=utf-8"; Request. Timeout=10000; HttpWebResponse Response=(HttpWebResponse) request.                GetResponse (); Stream Myresponsestream=Response.                GetResponseStream (); StreamReader Mystreamreader=NewStreamReader (Myresponsestream, Encoding.UTF8); stringRetString =Mystreamreader.readtoend ();                Mystreamreader.close ();                Myresponsestream.close (); returnretstring; }            Catch(Exception ex) {return NULL; }        }        /// <summary>        ///POST request and get results/// </summary>         Public Static stringHttpPost (stringUrlstringpostdatastr) {            Try{HttpWebRequest Request=(HttpWebRequest) webrequest.create (URL); Request. Method="POST"; Request. Timeout=6000000; Request. ContentType="application/x-www-form-urlencoded"; Request. ContentLength=postdatastr.length; StreamWriter writer=NewStreamWriter (Request.                GetRequestStream (), encoding.ascii); Writer.                Write (POSTDATASTR); Writer.                Flush (); HttpWebResponse Response=(HttpWebResponse) request.                GetResponse (); stringencoding =Response.                ContentEncoding; if(Encoding = =NULL|| Encoding. Length <1) {Encoding="UTF-8";//default Encoding} StreamReader Reader=NewStreamReader (response.                GetResponseStream (), encoding.getencoding (Encoding)); stringRetString =Reader.                ReadToEnd (); returnretstring; }            Catch(Exception ex) {return NULL; }        }    }

C # HTTP request get,post with retry parameters