Hi, I got the solution
string xml = @"xml string";
string url = "http://68.64.91.15:8080/EcProvWs/EcProvWs?wsdl";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
byte[] requestBytes = System.Text.Encoding.ASCII.GetBytes(xml);
req.Method = "POST";
req.ContentType = "text/xml;charset=utf-8";
req.ContentLength = requestBytes.Length;
Stream requestStream = req.GetRequestStream();
requestStream.Write(requestBytes, 0, requestBytes.Length);
requestStream.Close();
HttpWebResponse res = (HttpWebResponse)req.GetResponse();
StreamReader sr = new StreamReader(res.GetResponseStream(), System.Text.Encoding.Default);
string backstr = sr.ReadToEnd();
HttpContext.Current.Response.Write(backstr);
sr.Close();
res.Close();