private void DisplayCategories()
{
if (!String.IsNullOrEmpty(Request.QueryString["id"]))
{
Guid categoryId = new Guid(Request.QueryString["id"]);
PostList1.ContentBy = ServingContentBy.Category;
PostList1.Posts = Post.GetPostsByCategory(categoryId).ConvertAll(new Converter<Post, IPublishable>(delegate(Post p) { return p as IPublishable; }));
Page.Title = Category.GetCategory(categoryId).Title;
}
}