Allow Nullable String To Declaration?

Feb 13, 2010

How do I allow nullable string to my declaration?

I get this error "Type 'String' must be a value type or a type argument constrained to 'Structure' in order to be used with 'Nullable' or nullable modifier '?'." [:(]

Function Index(ByVal product As Product, ByVal category_1 As Nullable(Of String), ByVal category_2 As
Nullable(Of String)) As ActionResult
...
End Function

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