Problem with uploading presentation file (ppt/pps) to Zoho Show with HttpWebRequest in .NET

I try to upload ppt/pps file from my website, and it work well, but when I use HttpWebRequest object (.NET) to upload and get the response, it crashs.

My code:

public

static void Upload( string username, string password, string apiKey, string filePath)

{

var ticket = GetTicket(username, password);

if ( string .IsNullOrEmpty(ticket)) return ;

var requestUrl = "http://show.zoho.com/api/private/xml/uploadpresentation?apikey=" +

apiKey +

"&ticket=" + ticket;

var request = ( HttpWebRequest ) WebRequest .Create(requestUrl);

request.Method =

"POST" ;

//request.Headers = new WebHeaderCollection();

//request.Headers.Add("Accept", "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-ms-application, application/x-ms-xbap, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-shockwave-flash, */*");

string boundary = "-----------------------------" + DateTime .Now.Ticks.ToString( "x" );

//string boundary = "------" + Guid.NewGuid().ToString().Replace("-", "");

request.ContentType =

"multipart/form-data; boundary=" + boundary;

request.KeepAlive =

true ;

request.Credentials =

CredentialCache .DefaultCredentials;

var postDataStream = new MemoryStream ();

const string newLine = "\r\n" ;

var streamWriter = new StreamWriter (postDataStream);

streamWriter.Write(boundary + newLine);

streamWriter.Write(

"Content-Disposition: form-data; name=\"content\"; filename=\"" + ( new FileInfo (filePath)).Name + "\"" + newLine);

streamWriter.Write(

"Content-Type: application/vnd.ms-powerpoint" + newLine + newLine);

streamWriter.Flush();

var fileContent = ( new FileInfo (filePath)).OpenText().ReadToEnd();

streamWriter.Write(fileContent);

streamWriter.Write(newLine);

streamWriter.Write(boundary+newLine);

streamWriter.Flush();

streamWriter.Write(

"Content-Disposition: form-data; name=\"submit\"" + newLine + newLine);

streamWriter.Write(

"importpresentation" + newLine);

streamWriter.Write(boundary+

"--" + newLine);

streamWriter.Flush();

request.ContentLength = postDataStream.Length;

using ( var requestStream = request.GetRequestStream())

{

postDataStream.WriteTo(requestStream);

}

streamWriter.Close();

postDataStream.Close();

//var content = new StringBuilder();

//content.AppendLine(boundary);

//content.AppendLine("Content-Disposition: form-data; name=\"content\"; filename=\"" + (new FileInfo(filePath)).Name + "\"");

//content.AppendLine("Content-Type: application/vnd.ms-powerpoint");

//content.AppendLine("");

//var fileContent = (new FileInfo(filePath)).OpenText().ReadToEnd();

//content.AppendLine(fileContent);

//content.AppendLine(boundary);

//content.AppendLine("Content-Disposition: form-data; name=\"submit\"");

//content.AppendLine("");

//content.AppendLine("importpresentation");

//content.AppendLine(boundary + "--");

//Console.WriteLine(content);

//File.WriteAllText(@"e:\a.txt", content.ToString());

//byte[] data = ASCIIEncoding.UTF8.GetBytes(content.ToString());

//request.ContentLength = data.Length;

//var requestStream = request.GetRequestStream();

//requestStream.Write(data, 0, data.Length);

//requestStream.Close();

var response = request.GetResponse();

// Get the stream containing content returned by the server.

var responseStream = response.GetResponseStream();

// Open the stream using a StreamReader for easy access.

var reader = new StreamReader (responseStream);

// Read the content.

var responseFromServer = reader.ReadToEnd();

Console .WriteLine(responseFromServer);

// Display the content.

/// ViewData["content"] = responseFromServer;

//Console.WriteLine(responseFromServer);

// Clean up the streams.

reader.Close();

responseStream.Close();

response.Close();

}

I'm pretty sure that apikey, ticket are correct, the method i use works with other examples, but it doesn't work with Zoho Show Api. Is there any opinion?