public void NullableDateTime_HasValue()
        {
            var query = from w in EktronQueryFactory.Queryable<NullableWidget>()
                        where w.NullableDateTime.HasValue
                        select w;

            var actualTranslation = TestHelper.GetTranslation(query);
            var expectedTranslation = new DatePropertyExpression("NullableDateTime").IsNotNull();

            EkAssert.Equal(expectedTranslation, actualTranslation);
        }
 public override void Visit(DatePropertyExpression expression)
 {
     _expressionString.AppendFormat(" DATEPE'{0}' ", expression.Name);
 }