this stream does not support seek operations exception in c#

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C#

Hello ,
I am using this code.

WebRequest webRequest = WebRequest.Create(strURL);
webRequest.Method = "POST";
webRequest.ContentType = "application/x-www-form-urlencoded";
string parameters = "xml=" + s;
byte[] bytes = Encoding.UTF8.GetBytes(parameters);
webRequest.ContentLength = bytes.Length;
Stream dataStream = webRequest.GetRequestStream();
dataStream.Write(bytes, 0, bytes.Length);
dataStream.Close();
WebResponse webResponse = webRequest.GetResponse();
dataStream = webResponse.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
responseFields = reader.ReadToEnd();
reader.Close();
dataStream.Close();
webResponse.Close();

Here bytes length is 3050 and
It showing an exception that "this stream does not support seek operations" in
Stream dataStream = webRequest.GetRequestStream(); in this line


Thanks & Regards
Srishti