var sessionOptions = new SessionOptions();
sessionOptions.Protocol = Protocol.Sftp;
sessionOptions.HostName = pHostName;  
sessionOptions.UserName = pUserName;
sessionOptions.Password = pPassword;
sessionOptions.PortNumber = pPortNumber;
sessionOptions.Timeout = TimeSpan.FromSeconds(600); 
sessionOptions.SshHostKeyFingerprint = pHostKey;    
using (var session = new Session())
{
    // Connect
    try
    {
        session.DisableVersionCheck = true;
    }
    catch (Exception ex)
    {
    }
    finally
    {
        GC.Collect();
    }
 
    session.DebugLogLevel = 1;
    session.DebugLogPath = @"D:\winscp_log\debug\debug.log";
 
    session.Open(sessionOptions);
    logwriter.WriteLine(DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss") + "****************WinSCP Session established");
 
    var transferOptions = new TransferOptions();
    transferOptions.TransferMode = TransferMode.Binary;
    transferOptions.OverwriteMode = OverwriteMode.Overwrite;
 
    TransferOperationResult transferResult;
    if (pCloudTransfer == true)
    {
        logwriter.WriteLine(DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss") + "****************Inside cloud transfer flag.");
 
        transferResult = session.PutFiles(pInputFolderName + @"\*.csv", "/" + pCUploadFolder + "/", true, transferOptions);
    }
    else
    {
        logwriter.WriteLine(DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss") + "****************Inside dubai server flag.");
 
        transferResult = session.PutFiles(pInputFolderName + @"\*.csv", "/" + pDUploadFolder + "/", true, transferOptions);
    }
 
    // Throw on any error
    transferResult.Check();
 
    // Print results
    foreach (TransferEventArgs transfer in transferResult.Transfers)
    {
        Console.WriteLine(DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss") + "****************Upload of " + transfer.FileName + " succeeded");
        logwriter.WriteLine(DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss") + "****************Upload of " + transfer.FileName + " succeeded");
    }
}