/// <summary>
/// 后面新增字符
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BackCheckBox_CheckedChanged(object sender, EventArgs e)
{
if (BackCheckBox.Checked)
{
BackTextBox.Show();
}
else
{
BackTextBox.Hide();
BackTextBox.Text = "";
}
}
