The remote server returned an error: (553) File name not allowed.

try
{
    string filename = @"C:\Users\Admin\AppData\Local\Temp\Roaming.Doc";
    String ftpServerIP = "ftp://192.168.1.246:21/";
    FileInfo fileInf = new FileInfo(filename);
    FtpWebRequest request = (FtpWebRequest)FtpWebRequest.Create(ftpServerIP + "/" + fileInf.Name);
    request.Method = WebRequestMethods.Ftp.UploadFile;
    request.Credentials = new NetworkCredential("abc", "123$");
    request.UsePassive = true;
    request.UseBinary = true;
    request.KeepAlive = false;
    //Load the file
    FileStream stream = File.OpenRead(filename);
    byte[] buffer = new byte[stream.Length];

    stream.Read(buffer, 0, buffer.Length);
    stream.Close();

    Stream reqStream = request.GetRequestStream();
    reqStream.Write(buffer, 0, buffer.Length);
    reqStream.Close();
}
catch (Exception ex)
{
    Console.WriteLine(ex.Message);
    Console.ReadLine();
}