How to increase expiry timeout to 2-3 hrs in asp .net

using System;
using System.Web.UI;

public partial class _Default : Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    // Set this ASPX response to expire in one year.
    // ... This is essentially 'never'.
    Response.Cache.SetExpires(DateTime.Now.AddYears(1));
    }
}

Page that uses Response.Cache and Cache-Control: C#

using System;
using System.Web;
using System.Web.UI;

public partial class _Default : Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
	// Set cache for 1 hour on all computers and servers.
	// ... Proxies, browsers, and your server will cache it.
	Response.Cache.SetCacheability(HttpCacheability.Public);
	Response.Cache.SetMaxAge(new TimeSpan(1, 0, 0));
    }
}