private void tsmiSave_Click(object sender, EventArgs e)
{
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.DefaultExt = "*.ble";
saveFileDialog.Filter = "BLE Log Files(*.ble)|*.ble|Text Files(*.txt)|*.txt|All Files|*.*";
if (saveFileDialog.ShowDialog() != DialogResult.OK || saveFileDialog.FileName.Length <= 0)
return;
rtbMsgBox.SaveFile(saveFileDialog.FileName, RichTextBoxStreamType.PlainText);
}