Button enable and disable on text changed event

Question

I am wondering how I can set a button to disable if there is no text inside a text box, but when there is re enable it? Would I put it into a text changed event?

Answer 1

Did you mean something like this?

if (!string.IsNullOrEmpty(textBox1.Text))
    button1.Enabled = true;
else
    button1.Enabled = false;

Don't forget that you can change the default property of that button.