More mapping advice needed

Earlier I asked about mapping restricted/enumerated attributes to a different set of values in the destination schema, e.g.:

• Y->Approved
• N->Denied
• U->Unknown

trayburn suggested a functoid, so here's my first take on it (minus the boilerplate functoid stuff):

public string HashMatch(string inputValue, string valuePair1, string valuePair2, string valuePair3)
{

            string[] hashPair = { valuePair1, valuePair2, valuePair3 };

            System.Collections.Hashtable ht = new System.Collections.Hashtable(hashPair.Length);
            foreach (string entry in hashPair)
            {
                string[] keyValuePair = entry.Split(new char[] { '>' });
                ht.Add(keyValuePair[0], keyValuePair[1]);
            }

            return (string)ht[inputValue];

}

Usage would look like a link from the source schema, followed by constants describing the mapping, e.g. "Y>Approved", "N>Denied", "U>Unknown".

It appears to work for my test cases.  So apart from the hackney calling convention and waste of hashtable for a single lookup, is there anything wrong with this approach?

Thanks again