Null Value for a uniqueidentifier in a DropDownList

Hi,

I have a DropDownList with uniqueidentifiers as values and I
have
manually added a 'None' option like this:

        DropDownList parent =
siteSetupForm.FindControl("parentDDL")
as DropDownList;
        parent.Items.Insert(0,new ListItem("None",
null));

I have tried a few different approaches but I can't seem to
get around
this SQL error:
Conversion failed when converting from a character string
to
uniqueidentifier.
Does anyone know the syntax to pass that null without
sqlServer
thinking it's a string?
Thanks

Haze


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