private void sendFileBtn_Click(object sender, EventArgs e) { fileToSendPath = FileTools.ChooseFilePath("txt(*.*) | *.*"); if (fileToSendPath != "") { sendFileBtn.Enabled = false; stopSendFile.Enabled = true; sendFileWorker.RunWorkerAsync(); } else { MsgBox.ErrorMsg("File Error", "No file was selected, cancelling send process"); } }