制作“离开文本框”事件

Question

How can I make an event so when I leave a text box it enables a certain button? I'm pretty sure I need to somehow use the focus control but I don't know how.

Answer 1

Simply use the Leave event of the control, see some examples on MSDN .

private void textBox1_Leave(object sender, System.EventArgs e)
{
    this.button1.Enabled = true;
}

Answer 2

use this syntax textbox1_TextChanged