SQL Server populating a drop-down result set with Null

I have a drop down populated with a values from a table lets call SalesContacts.  Currently if someone selects any one of these contacts I take the selected value, set it to variable and essentially do a lookup/filter to display only the data of the selection.

My problem is if someone wants to clear the data they can not clear the data since I have no value called Null in the set of values.  How do I populate an additional value called Null for the universe of values ?
upobDaPlayaAsked:
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Shaun KlineLead Software EngineerCommented:
You could insert a new entry at the top of your list with a value (let's say -1) and text (maybe "(All)"). When this item is selected, your code / query would handle this specific value to "remove" the existing filter from the your query.
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
Give something like this a whirl, then when yu display it on your report only show the id and name columns:

SELECT NULL as id, '< ALL >' as name, 1 as sort_order
UNION ALL
SELECT id, name, 2 as sort_order
FROM SalesContacts
ORDER BY name, sort_order
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upobDaPlayaAuthor Commented:
Hi Jim,

It says invalid column name 'ID' ?  Is this the Unique ID of the table
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upobDaPlayaAuthor Commented:
Disregard..I got it..sorry
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upobDaPlayaAuthor Commented:
Thanks..for the suggestions
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