C# post using xcsrf token

I am trying to post xml data using c# fetching x-csrf-token

Am able to fetch token using get method and when I try to post I am getting 403 error. Please assist me if I am wrong

string Token = "";
public string Postdata = "<?xml version='1.0' encoding='utf-8'?> <entry xml:base='http://server:8000/sap/opu/odata/sap/ZCUST_TESTING_SRV/' xmlns='http://ift.tt/r5ut6F' xmlns:m='http://ift.tt/1dtZymv' xmlns:d='http://ift.tt/1cVQIMf'> <content type='application/xml'><m:properties><d:Kunnr>55556697</d:Kunnr><d:Land1>abi</d:Land1><d:Name1>abh</d:Name1><d:Name2>chaitanya</d:Name2><d:Ort01>kennedy</d:Ort01><d:Pstlz>500060</d:Pstlz><d:EStatus>X</d:EStatus></m:properties></content></entry>";
 public string URL = "http://server:8000/sap/opu/odata/sap/ZCUST_TESTING_SRV/post_cust";
                   
                    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
                    request.Credentials = new NetworkCredential("username","password");
                    request.ContentType = "application/atom+xml";
                    request.Accept = "application/xml,application/atom+xml";
                    request.Method = "GET";
                    request.Headers["x-csrf-token"] = "Fetch";
                    HttpWebResponse responseH = (HttpWebResponse)request.GetResponse();
                    Token = responseH.Headers["x-csrf-token"];
                    //xcookies = responseH.Headers["set-cookie"];
                    responseH.Close();
                   // Here I'm creating Post Method ...
                 string requestString = HttpUtility.UrlPathEncode(data); //XMLDoc is the XML data string being submitted.             
               byte[] byteArray = System.Text.Encoding.ASCII.GetBytes(postdata);
                HttpWebRequest request_post = (HttpWebRequest)WebRequest.Create(method);
                request_post.Credentials = new NetworkCredential("username", "password");
                request_post.Method = "POST";
                request_post.ContentType = "application/xml";
                request_post.Accept = "application/xml";
                request_post.Headers["x-csrf-token"] = Token;
                request_post.ContentLength = byteArray.Length;
                request_post.KeepAlive = false;
                Stream dataStream1 = request_post.GetRequestStream();
                dataStream1.Write(byteArray, 0, byteArray.Length);
                dataStream1.Close();
                HttpWebResponse response1 = (HttpWebResponse)request_post.GetResponse();
                 dataStream1 = response1.GetResponseStream();
                StreamReader reader1 = new StreamReader(dataStream1);
                string responseFromServer1 = reader1.ReadToEnd();
                reader1.Close();
                dataStream1.Close();
                response1.Close();