I am trying to do custom validation on a Gridview and a Checkbox.

What I want to do is to force a user to either :

Select at least one item in the Gridview

OR

Check a checkbox to indicate that the desired item was not in the list

The output variable from the GridView "SelectedSoftware" is null if nothing is selected from the Gridview. When I try to display SelectedSoftware.Count using a Display Content component I get "you cannot perform an array function on a null object".

Is there a way I can determine if nothing is selected in the GridView