Add Null Value to ComboBox

I need to display combobox bound to data field that can be null
I have a LINQ query that return a list on Items to display

How can I add to this list a Null value so in case I display a row with null value in that bound filed I wound get error message

And to let users select null value incase thay don't want any value in that field
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käµfm³d 👽Commented:
Use String.Empty instead of Nothing.

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DoronAviadCEOAuthor Commented:
I have a LINQ query that returns a list of strings
I am tryind to Union with the String.Empy with no success
                            Dim qtype = (From a In cn.ContactsTels
                                         Order By a.Type
                                        Select a.Type

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Any Idea ?
Instead of setting the data source of the list, add the empty item to the list manually and then loop through the LINQ query and add rest of the items.
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