>>ItemNo is a string. You assign null to a string like this:

ItemNo = null;

What are you trying to do? Assigning null to the string parameter or to a field of the datatable?
>>
>>>How can I fix this code

>public InventoryDS.ItemsDataTable Find(string ItemNo, string description)  
>>>        {
>>>            if (ItemNo.Equals(string.Empty))
>>>            { ItemNo = DBNull.Value; } // Intellisense doesn't like it

>Both parameters set to allow DbNull.
>
>BTW, would it allow it if it's not declared as string? It didn't complain in the code window.

Naomi, it depends if your variable type is a Value type or a Reference type. A value type (int, decimal, etc) cannot have null assigned to it, so your best bet is to use the Nullable generic and declare like:

Nullable<int > myValue = null;

A reference type (string, classes) are values in the stack that point to values on the heap. When you declare a reference type as null, you are essentially point it at nothing.