如何查看记录的用户信息？

Question

我有我的代码来检查当前登录的用户，它在本地主机上运行良好但是当我部署在服务器上时它不起作用。

private void checkUser()
{
    DirectorySearcher searcher = new DirectorySearcher();
    searcher.SearchScope = SearchScope.Subtree;
    searcher.Filter = string.Format(CultureInfo.InvariantCulture, "(sAMAccountName={0})", Page.User.Identity.Name);
    SearchResult findUser = searcher.FindOne();
    if (findUser != null)
    {
        DirectoryEntry user = findUser.GetDirectoryEntry();

        string Mobile = user.Properties["Mobile"].Value.ToString();
        string Login = user.Properties["sAMAccountName"].Value.ToString();
        if (user.Properties["Department"].Value != null)
            LoggedDepartement = user.Properties["Department"].Value.ToString();
        string title = user.Properties["title"].Value.ToString();

        data = user.Properties["thumbnailPhoto"].Value as byte[];  
    }
}