C# : upload image to fastpic.ru?

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C#

WinForms

Hi !
I want to upload image to fastpic.ru[^]

This is my code:

public string UploadImageToFastPic(string uploadfile, string url,string fileFormName, string contenttype)
{
    if ((fileFormName == null) || (fileFormName.Length == 0))
    {
        fileFormName = "file";
    }

    if ((contenttype == null) || (contenttype.Length == 0))
    {
        contenttype = "application/octet-stream";
    }

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

    HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(url);
    webrequest.CookieContainer = new CookieContainer();
    webrequest.ContentType = "multipart/form-data; boundary=" + boundary;
    webrequest.Method = "POST";


    // Build up the post message header
    StringBuilder sb = new StringBuilder();
    sb.Append(boundary);
    sb.Append("\r\n");
    sb.Append("Content-Disposition: form-data; name=\"");
    sb.Append(fileFormName);
    sb.Append("\"; filename=\"");
    sb.Append(Path.GetFileName(uploadfile));
    sb.Append("\"");
    sb.Append("\r\n");
    sb.Append("Content-Type: ");
    sb.Append(contenttype);
    sb.Append("\r\n");
    sb.Append("\r\n");

    sb.Append(boundary);
    sb.Append("\r\n");
    sb.Append("Content-Disposition: form-data; name=\"check_thumb\"");
    sb.Append("\r\n");
    sb.Append("\r\n");

    sb.Append("size");
    sb.Append("\r\n");
    sb.Append(boundary);
    sb.Append("\r\n");
    sb.Append("Content-Disposition: form-data; name=\"thumb_text\"");
    sb.Append("\r\n");
    sb.Append("\r\n");

    sb.Append("Увеличить");
    sb.Append("\r\n");
    sb.Append(boundary);
    sb.Append("\r\n");
    sb.Append("Content-Disposition: form-data; name=\"thumb_size\"");
    sb.Append("\r\n");
    sb.Append("\r\n");

    sb.Append("170");
    sb.Append("\r\n");
    sb.Append(boundary);
    sb.Append("\r\n");
    sb.Append("Content-Disposition: form-data; name=\"res_select\"");
    sb.Append("\r\n");
    sb.Append("\r\n");

    sb.Append("500");
    sb.Append("\r\n");
    sb.Append(boundary);
    sb.Append("\r\n");
    sb.Append("Content-Disposition: form-data; name=\"orig_resize\"");
    sb.Append("\r\n");
    sb.Append("\r\n");

    sb.Append("500");
    sb.Append("\r\n");
    sb.Append(boundary);
    sb.Append("\r\n");
    sb.Append("Content-Disposition: form-data; name=\"orig_rotate\"");
    sb.Append("\r\n");
    sb.Append("\r\n");

    sb.Append("0");
    sb.Append("\r\n");
    sb.Append(boundary);
    sb.Append("\r\n");
    sb.Append("Content-Disposition: form-data; name=\"jpeg_quality\"");
    sb.Append("\r\n");
    sb.Append("\r\n");

    sb.Append("75");
    sb.Append(boundary);
    sb.Append("Content-Disposition: form-data; name=\"submit\"");
    sb.Append("\r\n");
    sb.Append("\r\n");

    sb.Append("Загрузить");
    sb.Append("\r\n");
    sb.Append(boundary);
    sb.Append("\r\n");
    sb.Append("Content-Disposition: form-data; name=\"uploading\"");
    sb.Append("\r\n");
    sb.Append("\r\n");

    sb.Append("1");
    sb.Append("\r\n");
    sb.Append(boundary);
    sb.Append("--");

    string postHeader = sb.ToString();
    byte[] postHeaderBytes = Encoding.UTF8.GetBytes(postHeader);

    // Build the trailing boundary string as a byte array
    // ensuring the boundary appears on a line by itself
    byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");

    FileStream fileStream = new FileStream(uploadfile, FileMode.Open, FileAccess.Read);
    long length = postHeaderBytes.Length + fileStream.Length + boundaryBytes.Length;
    webrequest.ContentLength = length;

    Stream requestStream = webrequest.GetRequestStream();

    // Write out our post header
    requestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);

    // Write out the file contents
    byte[] buffer = new Byte[checked((uint)Math.Min(4096, (int)fileStream.Length))];
    int bytesRead = 0;
    while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
        requestStream.Write(buffer, 0, bytesRead);

    // Write out the trailing boundary
    requestStream.Write(boundaryBytes, 0, boundaryBytes.Length);
    WebResponse responce = webrequest.GetResponse();
    Stream s = responce.GetResponseStream();
    StreamReader sr = new StreamReader(s);

    return sr.ReadToEnd();
}

my code in form main :

richTextBox_FullStory.Text = pro.UploadImageToFastPic("E:\\The Haves.jpg","http://fastpic.ru/uploadmulti", "file[]", "image/jpeg");

but I can't get link image uploaded to fastpic.ru
result of response still not upload image
somebody help me, please!!!!!