MVC Action Filter to manage caching.cs

public class BrowserCacheAttribute : ActionFilterAttribute  
{  
    /// <summary>  
    /// Gets or sets the cache duration in seconds.   
    /// The default is 10 seconds.  
    /// </summary>  
    /// <value>The cache duration in seconds.</value>  
    public int Duration  
    {  
        get;  
        set;  
    }  

    public bool PreventBrowserCaching   
    {   
        get;   
        set;   
    }  

    public BrowserCacheAttribute()  
    {  
        Duration = 10;  
    }  

    public override void OnActionExecuted(ActionExecutedContext filterContext)  
    {  
        if (Duration < 0) return;  

        HttpCachePolicyBase cache = filterContext.HttpContext.Response.Cache;  

        if (PreventBrowserCaching)  
        {  
            cache.SetCacheability(HttpCacheability.NoCache);  
            Duration = 0;  
        }  
        else  
        {  
            cache.SetCacheability(HttpCacheability.Public);  
        }  

        TimeSpan cacheDuration = TimeSpan.FromSeconds(Duration);  
        cache.SetExpires(DateTime.Now.Add(cacheDuration));  
        cache.SetMaxAge(cacheDuration);  
        cache.AppendCacheExtension("must-revalidate,proxy-revalidate");  
    }  
}