Combo Box Issue

[DBaker7777]

I have a combo box (cbo1) that has values from another table. I then have a textbox that has a dlookup expression that looks up the value in the combobox (cbo1). That part works fine until I select another combobox or checkbox the result from the dlookup of the textbox changes to #Value! every single time. It will not hold the dlookup result. (cbo1) still has what the user selected, but like I said the textbox dlookup goes to #Value! What am I missing here?

[Bob Fitz]

I then have a textbox that has a dlookup expression that looks up the value in the combobox (cbo1).....

Instead of using DLookup() it would be better to include the required data in a hidden column of the combobox. Then reference that column from the textbox by setting the Record Source property of the textbox with something like:
=NameOfCombo.Column(2)

The number in brackets is the column to be returned. The column count is zero based so the first column would be (0), the second would be (1) etc.

[Micron]

Why would you want the same value in 2 different controls on the same form anyway?
For me, question 2 is less important - why not just make textbox equal combo value or a column value rather than DLookup on a combo? Or is the word "lookup" in that case not the DLookup function?
BTW, if you can DLookup on a combo, that's news to me.