How to deserialize xml data in visual studio 2008 c#

string ss = @"<IsValidAdminUserResponse><IsValidStatus><a:AdminMasterDC><a:AuthKey>Valid</a:AuthKey><a:RtnMessage>success</a:RtnMessage><a:EmailAddress>support@abc.com</a:EmailAddress><a:UserId>1</a:UserId><a:HubId>22</a:HubId></a:AdminMasterDC></IsValidStatus></IsValidAdminUserResponse>";
                
                var reader = new StringReader(ss);
                var serializer = new XmlSerializer(typeof(IsValidStatu));
                var instance = (IsValidStatu)serializer.Deserialize(reader);
                MessageBox.Show(instance.RtnMessage);

public class IsValidStatu
        {
            public string AuthKey { get; set; }
            public string RtnMessage { get; set; }
            public string EmailAddress { get; set; }
            public string UserId { get; set; }
            public string HubId { get; set; }
        }