Selection From ListBox Not Populating TxtBox

[HTSCF Fareha]

I seem to be going around in ever decreasing circles.

I'm trying to get any selction from a ListBox to populate a defined TxtBox. At the moment the ListBox populates from the array okay, but selecting anything leaves the TxtBox empty.

The ListBox is called lbReason and the TextBox txtReason.

Thanks!
Steve