upload file in box api with multipart/form-data in c#

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C#

File-Upload

I am trying to upload file in box using box api

its Give me Error is Bad Request

whats wrong in this code please help me

public static FileDetails PutFile(string token, byte[] filebytes, string FolderId, string filename, string

filecontentType) {
Encoding encoding = Encoding.UTF8;
FileDetails objFile = new FileDetails();
Stream formDataStream = new System.IO.MemoryStream();
string formDataBoundary = String.Format("----------{0:N}", Guid.NewGuid());
string boundry = formDataBoundary;
string contentType = "multipart/form-data;boundary=" + boundry;

try
{

//request.ContentLength = bytes.Length;

Attributes attributes = new Attributes();
attributes.name = Path.GetFileNameWithoutExtension(filename);
attributes.parent = new Parent();
attributes.parent.id = FolderId;

string header = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"{1}\"; filename=\"{2}\";\r\nContent-Type: {3}\r\n\r\n",
boundry,
"file",
filename,
filecontentType ?? "application/octet-stream");

formDataStream.Write(encoding.GetBytes(header), 0, encoding.GetByteCount(header));

formDataStream.Write(filebytes, 0, filebytes.Length);

string jsonstring = new JavaScriptSerializer().Serialize(attributes);
string data = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"{1}\";\r\n{2}\r\n\r\n",
boundry,
"attributes",
jsonstring);

formDataStream.Write(encoding.GetBytes(data), 0, encoding.GetByteCount(data));

string footer = "\r\n--" + boundry + "--\r\n";

formDataStream.Write(encoding.GetBytes(footer), 0, encoding.GetByteCount(footer));



formDataStream.Position = 0;
byte[] formData = new byte[formDataStream.Length];
formDataStream.Read(formData, 0, formData.Length);
formDataStream.Close();

var uri = "https://upload.box.com/api/2.0/files/content";

var request = (HttpWebRequest)WebRequest.Create(uri.ToString());
request.Method = "POST";
request.ContentType = contentType;
request.Headers.Add("Authorization", "Bearer " + token);
request.ContentLength = formData.Length;


using (Stream requestStream = request.GetRequestStream())
{
requestStream.Write(formData, 0, formData.Length);
requestStream.Close();
}


var response = request.GetResponse();
var reader = new StreamReader(response.GetResponseStream());
var accessToken = reader.ReadToEnd();

response.Close();


}
catch (WebException e)
{
var resp = new StreamReader(e.Response.GetResponseStream()).ReadToEnd();
}

return objFile;
}