FtpPutFile from wininet.dll returning false everytime

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C#

FTP

Hello All,

The FtpPutFile from wininet.dll is returning false everytime i try to upload some thing to FTP.

Below is the code snippet that i am using:

[DllImport("wininet.dll", SetLastError = true, CharSet = CharSet.Auto)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool FtpPutFile(IntPtr hConnect, string lpszLocalFile,
string lpszNewRemoteFile, int dwFlags, IntPtr dwContext);

//Enums for connectivity
private Int32 INTERNET_OPTION_CONNECTED_STATE  = 50;
private Int32 INTERNET_STATE_CONNECTED  = 1;
private uint INTERNET_FLAG_RELOAD = 0x80000000;
private const int InternetFlagTransferBinary = 0x00000002;


//The structure which contains the Connection States
struct INTERNET_CONNECTED_INFO
{
    public Int32 dwConnectedState;
    public Int32 dwFlags;
}

private string _ipaddress = string.Empty;
private string _username= string.Empty;
private string _password = string.Empty;


{
    try
    {
        IntPtr hSession = InternetOpen("FTP", 1, string.Empty, string.Empty, 4000000);
        IntPtr hConnect = InternetConnect(hSession, _ipaddress, 21, _username, _password, 1, 2, IntPtr.Zero);

        bool status = FtpPutFile(hConnect,localfile,remoteFile,(int)INTERNET_FLAG_RELOAD,IntPtr.Zero);
        InternetCloseHandle(hConnect);
        InternetCloseHandle(hSession);
        ErrorLog.WriteLogMsg("UploadFile(): Status: " + result);

        if (status == false)
        {
            var error = Marshal.GetLastWin32Error();

            throw new Exception(
                string.Format("UploadFile failed: {0}", error));
        }
        return status;
    }
    catch (Exception ex)
    {
        ErrorLog.WriteErrorLog(ex);
        return false;
    }
}

Please let me know why i am getting "status" as false everytime. Is there any syntax problem or something else.
Thank you.