Output cache in content and master page

asp.netoutputcache

Two questions:

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

<%@ OutputCache ...%>

Does it cache the whole page or only the content page portion?

2. How can I apply OutputChace in the master page?

I have a master page that has a lot of content pages that uses it. I want to apply the same outputcache profile on all of them, but I dont want to go one by one and change them.

Thanks.

Best Answer

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);
        }
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