[Solved] Why is this object reference supposedly not set to an instance of an object that has obviously been identified by the compiler?

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The fix ended up being simple, and even logical, in hindsight.

The controls are dynamically added to the form, like so:

formCustCatMaint.Controls.Add(coName)
And so, replacing this line, in the loop:

For Each cntrl As Control In Me.Controls
…with this:

For Each cntrl As Control In formCustCatMaint.Controls
And this line, in the GetLabelTextForID() function:

For Each cntrl As Control In Me.Controls
…with this:

For Each cntrl As Control In formCustCatMaint.Controls
…did the trick. The controls are being found, and the code is working as designed/originally expected.

Nebenbei bemerkt, this also works fine now:

If TypeOf cntrl Is CheckBox Then

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solved Why is this object reference supposedly not set to an instance of an object that has obviously been identified by the compiler?