HowTo: Select text

I'm a C# newbie trying to convert a MFC application to C#. I have a multiline read-only text box and I want a substring of the textbox text to be selected.

In the constructor, this works:

InitializeComponent();
myTextBox.Text = "0123456789";
myTextBox.SelectionStart = 2;
myTextBox.SelectionLength = 3;

My question concerns causing selection highlighting during a "click handler". For instance, I have a button that should cause a substring within the myTextBox to be selected:

private void buttonClicked(object sender, System.EventArgs e)
{
  myTextBox.SelectionStart = 2;
  myTextBox.SelectionLength = 3;
  tbContext.Invalidate();  // Doesn't help
}

Seems like the above ought to work, but nothing happens. My impression is I need a statement (or statements) that does something like "invalidate" so the myTextBox will be repainted and the selection will take effect. What am I doing wrong or leaving out?

TIA
LVL 1
newton-allanAsked:
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CesarGonConnect With a Mentor Commented:
The text box must have focus in order for SelectionStart and SelectionLength to work.
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