Problem in Uploading a text file into FTP Server

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C#

Hi frds,

I m using the below code and getting error "The remote server returned an error: (550) File unavailable (e.g., file not found, no access)". Please tell me how to resolve this problem.

private void Upload(string filename)
{
FileInfo fil = new FileInfo(filename);

FtpWebRequest requestFTPUploader = (FtpWebRequest)WebRequest.Create(FtpServerName+"/"+FtpFilePath+"/" + fil.Name);
requestFTPUploader.Credentials = new NetworkCredential(FtpUserId, FtpPassword);
requestFTPUploader.Method = WebRequestMethods.Ftp.UploadFile;

ServicePoint LServicePoint = requestFTPUploader.ServicePoint;
LServicePoint.ConnectionLimit = 1;
requestFTPUploader.Proxy = new WebProxy() { UseDefaultCredentials = true };


FileInfo fileInfo = new FileInfo(filename);
FileStream fileStream = fileInfo.OpenRead();

int bufferLength = 2048;
byte[] buffer = new byte[bufferLength];

Stream uploadStream = requestFTPUploader.GetRequestStream();
int contentLength = fileStream.Read(buffer, 0, bufferLength);

while (contentLength != 0)
{
uploadStream.Write(buffer, 0, contentLength);
contentLength = fileStream.Read(buffer, 0, bufferLength);
}

uploadStream.Close();
fileStream.Close();

requestFTPUploader = null;

}