Uploading files to server

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C#

hi, please can u advice me with upload on server with your method using webrequests? How i can create stringBuilder on another server? and why its return this?
"
<h1>Software error:</h1>
<pre>Malformed multipart POST
</pre>
<p>
For help, please send mail to the webmaster (<a href="mailto:webmaster@ulozto.cz">webmaster@ulozto.cz</a>), giving this error message
and the time and date of the error.

</p>
"

my code of program :
"
public string QUploadToUlozto(string FilePath, string username,
string password, int AccountType)
{
FileSystemInfo _file = new FileInfo(FilePath);
DateTime dateTime2 = DateTime.Now;
long l2 = dateTime2.Ticks;
string s1 = "----------" + l2.ToString("x");
System.Net.HttpWebRequest httpWebRequest = GetWebrequest(s1);
using (System.IO.FileStream fileStream = new FileStream(_file.FullName,
FileMode.Open, FileAccess.Read, FileShare.Read))
{//Set Headers for Uploading
byte[] bArr1 = Encoding.ASCII.GetBytes("\r\n--" + s1 + "\r\n");
string s2 = GetRequestMessage(s1, _file.Name, username, password, AccountType);
byte[] bArr2 = Encoding.UTF8.GetBytes(s2);
Stream memStream = new MemoryStream();
memStream.Write(bArr1, 0, bArr1.Length);
memStream.Write(bArr2, 0, bArr2.Length);
byte[] buffer = new byte[1024];
int bytesRead = 0;//Read File into memStream.
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
memStream.Write(buffer, 0, bytesRead);

}
httpWebRequest.ContentLength = memStream.Length;
fileStream.Close();

Stream requestStream = httpWebRequest.GetRequestStream();
//Send File from memStream to Rapidshare.com
memStream.Position = 0;
byte[] tempBuffer = new byte[memStream.Length];
memStream.Read(tempBuffer, 0, tempBuffer.Length);
memStream.Close();
requestStream.Write(tempBuffer, 0, tempBuffer.Length);
requestStream.Close();
}
string tm = "";
using (Stream stream = httpWebRequest.GetResponse().GetResponseStream())
using (StreamReader streamReader = new StreamReader(stream))
{
tm = streamReader.ReadToEnd();

}//Get Response from Rapidshare and Return the Links.
return tm;
}

private string GetRequestMessage(string boundary, string FName,
string username, string password, int AccountType)
{
System.Text.StringBuilder stringBuilder = new StringBuilder();
stringBuilder.Append("--");
stringBuilder.Append(boundary);
stringBuilder.Append("\r\n");
stringBuilder.Append("Content-Disposition: form-data; name=\"toolmode2\"");
stringBuilder.Append("\r\n");
stringBuilder.Append("\r\n");
stringBuilder.Append("1");
stringBuilder.Append("\r\n");
stringBuilder.Append(boundary);
stringBuilder.Append("\r\n");
if (AccountType != 0)//Free User
{
}//else if Free User
//File Name

stringBuilder.Append(boundary);
stringBuilder.Append("\r\n");
stringBuilder.Append("Content-Disposition: form-data; name=\"");
stringBuilder.Append("upfile_0");
stringBuilder.Append("\"; filename=\"");
stringBuilder.Append(FName);
stringBuilder.Append("\"");
stringBuilder.Append("\r\n");
//File Type
stringBuilder.Append("Content-Type: ");
stringBuilder.Append("multipart/form-data");
stringBuilder.Append("\r\n");
stringBuilder.Append("Content-Transfer-Encoding: ");
stringBuilder.Append("binary");
stringBuilder.Append("\r\n");
stringBuilder.Append("\r\n");

return stringBuilder.ToString();
}

private CookieContainer _cockies = new CookieContainer();
private HttpWebRequest GetWebrequest(string boundary)
{//Prepare for Uploading
WebClient wc = new WebClient();
System.Uri uri = new Uri("http://up.uloz.to/ul/upload.cgi?tmp_sid=" + "4b8952990b8b1518ab1729728394bh29" + "&user_id=0&host=uloz.to");

System.Net.HttpWebRequest httpWebRequest = (
System.Net.HttpWebRequest)System.Net.WebRequest.Create(uri);
httpWebRequest.CookieContainer = _cockies;//Set Cookies for rapidshare
httpWebRequest.ContentType = "multipart/form-data; boundary=" + boundary;
//Set Fake userAgent exactly like Rapidshare Manager
httpWebRequest.UserAgent = "MultiloadUploader";
//Set Fake Referer
httpWebRequest.Referer = "http://uloz.to/";
httpWebRequest.Method = "POST";
httpWebRequest.KeepAlive = true;
httpWebRequest.Timeout = -1;
httpWebRequest.Headers.Add("Accept-Charset", "iSO-8859-1,utf-8;q=0.7,*;q=0.7");
httpWebRequest.Headers.Add("Accept-Encoding", "identity");
httpWebRequest.Headers.Add("Accept-Language", "de-de;q=0.5,en;q=0.3");
return httpWebRequest;
}
"

sorry for my bad english and thanx :)