Gridview and "NULL" DateTime

I have a Gridview with an ObjectDataSource bound to it. The class handling the SelectMethod returns some DateTime fields that are for all purposes NULL, but actually DateTime.MinValue since a DateTime cannot be NULL.

I don't want to display these values in the Gridview, since they don't make any sense. Is it bad form to type a method as Object and return different types like so:

        public object Fax
        {
            get
            {
                if (fax.Date == DateTime.MinValue)
                {
                    return null;
                }
                else
                {
                    return fax;
                }
            }
            set { fax = (DateTime)value; }
        }

If it is, how could I inform the Gridview to hide the DateTime.MinValue?
DarinAlredAsked:
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Justin_WConnect With a Mentor Commented:
> Is it bad form to type a method as Object and return different types like so:

It is absolutely not bad practice. It does seem kind of inelegant from a purist's POV, but unfortunately that is one of the best solutions that we as developers are left with given Microsoft's implementation of DBNull/null/valuetype issues.
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