void ValueEditor_TextChanged3(object sender, EventArgs e)
{
TextBox textBox = sender as TextBox;
if (textBox != null && textBox.Text.Length >= 4)
{
int years = Convert.ToInt32(textBox.Text);
if (years < 10000)
{
textBox.Text = string.Format("{0:0000}", years);
okButton.Focus();
}
else
{
textBox.Text = textBox.Text.Substring(0, years >= 10000 ? 4 : 3);
textBox.Select(4, 1);
}
}
}
