TextChanged Event of NumericUpDown

I am using Microsoft Visual C# 2010 Express. When i change the value of numericUpDown using arrows, my button becomes enable. But i also want to enable my button when i change the value of numericUpDown by changing the text directly.

I am using the following code:

private void numericUpDown1_ValueChanged(object sender, EventArgs e)
{
    button1.Enabled = true;
}