public byte[] GetResourceContents(ItemIdentifier itemId, Type itemType, Resource resource, string revision)
        {
            //encrypt login and password
            string loginName = "";
            string pass = "";
            getloginAndPass(UserId, ref loginName, ref pass);
            string _url = getWSUrl(this.Url);

            string typeName = itemType.AssemblyQualifiedName;

            RepositoryWebservice repo = new RepositoryWebservice(_url);
            byte[] resourceContent = Convert.FromBase64String( repo.GetResourceContents(this.SessionKey, itemId, typeName, resource, loginName, pass));
            repo.Dispose();

            return resourceContent;
        }