[2.0] Get a type and coerce value to that type

[dee-u]

I have the ff. 'ugly' code:

private void InsertWhereParameter(WhereParameter whereParameter)
        {
            Type t = whereParameter.FieldValue.GetType();
            switch (t.ToString())
            {
                case "System.String":
                    _dataAccess.AddWhereParameter(whereParameter.FieldName, (String)whereParameter.FieldValue);
                    break;
                case "System.DateTime":
                    _dataAccess.AddWhereParameter(whereParameter.FieldName, (DateTime)whereParameter.FieldValue);
                    break;

Is there something I am missing that would make it work like...

Type t = whereParameter.FieldValue.GetType();
_dataAccess.AddWhereParameter(whereParameter.FieldName, (t)whereParameter.FieldValue);

TIA