Renci.SshNet.SftpClient.BeginUploadFile C# (CSharp) Method

        public IAsyncResult BeginUploadFile(Stream input, string path)
        {
            return BeginUploadFile(input, path, true, null, null);
        }

        public bool UploadToSFTP(MemoryStream ms, string filename, bool overwrite)
        {
            string strPath = sshPath;
              if (!strPath.StartsWith("/")) {
            strPath = "/" + strPath;
              }
              if (!strPath.EndsWith("/")) {
            strPath += "/";
              }

              bool bRet = true;
              bool bWait = true;

              sshError = "";

              if (sshConnection == null || !sshConnection.IsConnected) {
            bool bResume = false;
            bool bOK = false;
            connectionDoneCallback = (bool bSuccess) => {
              bOK = bSuccess;
              bResume = true;
            };
            Connect();
            while (!bResume) System.Threading.Thread.Sleep(1);
            if (!bOK) {
              sshError = "Couldn't connect to server.";
              return false;
            }
              }

              try {
            this.ProgressBar.Start(filename, ms.Length);
            ms.Seek(0, SeekOrigin.Begin);
            IAsyncResult arUpload = null;
            AsyncCallback cbFinished = (IAsyncResult ar) => {
              bRet = true;
              bWait = false;
            };
            Action<ulong> cbProgress = new Action<ulong>((ulong offset) => {
              this.ProgressBar.Set((long)offset);
              if (this.ProgressBar.Canceled) {
            sshConnection.EndUploadFile(arUpload);
            bRet = false;
            bWait = false;
              }
            });
            try {
              arUpload = sshConnection.BeginUploadFile(ms, strPath + filename, overwrite, cbFinished, filename, cbProgress);
            } catch {
              // failed to upload, queue it for a retry after reconnecting
              sshConnection = null;
              connectionDoneCallback = (bool bSuccess) => {
            if (!bSuccess) {
              bRet = false;
              sshError = "Upload failed because couldn't connect to server.";
              bWait = false;
              return;
            }
            try {
              arUpload = sshConnection.BeginUploadFile(ms, strPath + filename, overwrite, cbFinished, filename, cbProgress);
            } catch (Exception ex) {
              bRet = false;
              sshError = "Upload failed twice: " + (ex.InnerException != null ? ex.InnerException.Message : ex.Message);
              bWait = false;
            }
              };
              Connect();
            }
              } catch (Exception ex) {
            bRet = false;
            bWait = false;
            sshError = ex.InnerException != null ? ex.InnerException.Message : ex.Message;
            throw ex;
              }

              while (bWait) System.Threading.Thread.Sleep(1);

              this.ProgressBar.Done();
              return bRet;
        }