private void ButtonBack_Click(object sender, EventArgs e)
{
if (TextStkNew.Count != 0)
{
textBoxNew.Text = (string)TextStkNew.Peek();
textBoxOld.Text = (string)TextStkOld.Peek();
TextStkNew.Pop();
TextStkOld.Pop();
}
else
{
textBoxNew.Text = "";
textBoxOld.Text = "";
}
}
new private void TextChanged()
{
TextStkNew.Push(textBoxNew.Text);
TextStkOld.Push(textBoxOld.Text);
}