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

Something like that (WinForms):

private void myTextBox_TextChanged(object sender, EventArgs e) {
  myButton.Enabled = !String.IsNullOrEmpty(myTextBox.Text);       
}

EDIT: For initial form load you can use Load event:

private void myForm_Load(object sender, EventArgs e) {
  myButton.Enabled = !String.IsNullOrEmpty(myTextBox.Text); 
}