Few weaks ago I've changed target .NET framework for my application to the 4th version. Recently my resharper told me that my variable "MetaDescription" hides property 'string System.Web.UI.Page.MetaDescription'

After small investigation the peace of code that worked earlier:

    HtmlMeta MetaDescription = new HtmlMeta();
    MetaDescription.Attributes.Add("name", "description");
    MetaDescription.Attributes.Add("content", ((IFriendlySEO)Page).DescriptionString);
    Header.Controls.Add(MetaDescription);

was replaced with much more readable:

    MetaDescription = ((IFriendlySEO)Page).DescriptionString;

(same for MetaKeywords).

Question: is there any useful source that can give a list of such new features?

Thanks.