The remote server returned an error: (404) Not Found. while calling WCF RESt Service from C#

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C#

Hi I have below code

string uri = "http://localhost:38936/UploadService.svc/UploadFile/";
uri += Guid.NewGuid().ToString() + "/r/3/First_Chunk/siusdhf";

System.Net.HttpWebRequest req = WebRequest.Create(uri) as HttpWebRequest;
req.KeepAlive = false;
req.Method = "POST";

System.IO.Stream streamObj = req.GetRequestStream();

//D:\Images\C#.jpg

byte[] buffer = System.IO.File.ReadAllBytes(@"D:\Video\images.jpg");
//req.ContentLength = buffer.Length;
//req.ContentType = "application/octet-stream";

streamObj.Write(buffer, 0, buffer.Length);
streamObj.Close();


HttpWebResponse resp = req.GetResponse() as HttpWebResponse;

its giving exception of
The remote server returned an error: (404) Not Found

what's wrong in this?