Set cursor position in TextBox

I did this:

this.myTextBox.SelectionLength = 0;
this.myTextBox.SelectionStart = 3;

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but it seems to have no effect.

Try focusing the TextBox before you fiddle with the selection points:

this.myTextBox.Focus();
this.myTextBox.SelectionLength = 0;
this.myTextBox.SelectionStart = 3;

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If that doesn't help, where and when you do have that code?

No difference using Focus().

I'm playing with the location of those lines of code. The class is a subclass of UserControl. The first location was the constructor. Now I've moved it to OnLoad(), but still no joy.

It's not something that can be done once, such as the Contructor() or OnLoad().  You'd have to do it in the GotFocus() event of your TextBox, for example...

I see your point. In that case, I would like to do something like this:

this.myTextBox.OnGotFocus += new System.EventHandler(this.myTextBox_OnGotFocus);

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but OnGotFocus is not an option.

That's it:

private void myTextBox_GotFocus(object sender, EventArgs e)
{
        this.txtCrrNumber.SelectionStart = 3;
        this.txtCrrNumber.SelectionLength = 0;
}

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