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public static void CheckAllPropertiesAreNotNull<T>(this T objectToInspect, 
                                                params Func<T, object>[] getters)
{
    if (getters.Any(f => f(objectToInspect) == null))
        Assert.Fail("some of the properties are null");
}

var myDto = new MyDto();

myDto.CheckAllPropertiesAreNotNull(x => x.Description, 
                                   x => x.Id);