Output cache in content and master page

Question

Two questions:

1. If I have a content page and a master page and I put this inside my content page:

<%@ OutputCache ...%>


        

Answer 1

Content page only will be cached; unless that content page is using the master page, in which case master page also will be cached.

Unlike a content page you can't use OutputCache directive for master page. See the below links

Cache Master Page in ASP.NET

http://www.dotnetperls.com/output-cache

http://forums.asp.net/t/1236981.aspx

Answer 2

The whole page is cached. Edit
You can use user controls to cache portions.

As by the comments, if you want to cache all pages that are using a specific master page, you need the following code in the master page

 protected void Page_Load(object sender, EventArgs e)
        {
            Response.Cache.SetExpires(DateTime.Now.AddMonths(1));
            Response.Cache.SetCacheability(HttpCacheability.ServerAndPrivate);
            Response.Cache.SetValidUntilExpires(true);
        }