Dear EpiServer Team, please help.

I have a page InfoPage with the fields InfoAddress, ....

public class InfoPage : BasePage
{     
        public virtual string InfoAddress { get; set; }

        public virtual string InfoAddress1 { get; set; }

        public virtual string InfoAddress2 { get; set; }

}

When I save content It's necessary to check, was the field InfoAddress chenged from the last publish?

I found information about how to get the version of the page

 var versionRepository = ServiceLocator.Current.GetInstance<IContentVersionRepository>();
ContentVersion publishedPage = versionRepository.LoadPublished(currentPage.ContentLink);

But how to get the last published version of the field InfoAddress I don't know.

Please, help.

Thank you in advance.