I have a text box control (or label control) that needs to display the value of a list/combo box on the same form: If user selects a different item from that list, the text box control should display what the user selected from the list.

Typically, combo boxes are used to bind to a foreign key in a lookup table (the control's value) while displaying meaningful text (the control's DisplayValue). The DisplayValue always comes from the first column of the control's RowSource with the value is taken from its BoundColumn. So what is displayed in the combo box may ot be the same as its value.

If you want the text box to display the combo's value, the advice Nadya gave you is correct. If you want the text box to display the same thing as the combo box is displaying, you want to do it like this in the combo's InteractiveChange() or the combo's Valid():

This.Parent.Textbox.Value = This.DisplayValue