public override object GetNewPropValue(ExpectUpdate attr, object obj, PropertyInfo prop)
        {
            object newValue = null;

            var values = new List <string>();

            values.Add("4");
            values.Add("15");

            if (prop.PropertyType == typeof(string))
            {
                newValue = RndService.RandomFromArray(values);
            }

            if (prop.PropertyType == typeof(Collection <string>))
            {
                newValue = RndService.RandomCollectionFromArray(values);;
            }

            if (prop.PropertyType == typeof(List <string>))
            {
                newValue = RndService.RandomListFromArray(values);
            }

            return(newValue);
        }