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I need help adding error trapping code to a  DataGridViewComboBoxColumn in my VB.Net application

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Last Modified: 2017-03-16
Hi Experts,
I add a DataGridViewComboBoxColumn to my DataGridViewControl in my VB.Net application.
I need help troubleshooting, and adding error trapping code.

I get an error when the "blank" option is selected (I have included and image of the error below).

Please help me and let me know how I can prevent this error from ocurring.  Thank you.

MY CODE
Code
MY INTERFACE
Empty Value Selected
THE ERROR I GET
Error

Thank you all for your help in advance,
mrotor
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