What I'm looking for is how to send a file to a web service in Base64 format, using Http Post. I know this can be done using SOAP, but I'd like to know how to do this using Http Post.

My thinking was to use HttpWebRequest something along the lines of the code listed below.

protected Byte[] data;

//  logic to stream the file to the byte array
//  goes here

//  post file to service
string postData = "file=" + HttpUtility.UrlEncode(data,0,filelength) +
"&name=" + HttpUtility.UrlEncode("image.jpg");

           
UTF8Encoding encoding = new UTF8Encoding();
byte[] buffer = encoding.GetBytes(postData);
       

string _webServiceURI="http://localhost/webservice.asmx";
           string _webMethodName="Upload";
           string uri = _webServiceURI + "/" + _webMethodName;

           HttpWebRequest httpRequest = (HttpWebRequest)HttpWebRequest.Create(uri);
           httpRequest.Method = "POST";
           httpRequest.KeepAlive = false;
           httpRequest.ContentType = "application/x-www-form-urlencoded";
           httpRequest.ContentLength = buffer.Length;
           httpRequest.Timeout = 30000;
           httpRequest.GetRequestStream().Write(buffer, 0, byte1.Length);
           httpRequest.GetRequestStream().Close();

This is the stub for the web service :

[WebMethod (MessageName="Upload")]
public string  Upload(Byte[] file, string name)
{

}