In C#, is it possible to decorate a method with an annotation to populate the cache object with the return value of the method?

Currently I'm using the following class to cache data objects:

public class SiteCache
{
// 7 days + 6 hours (offset to avoid repeats peak time)
    private const int KeepForHours = 174; 
    public static void Set(string cacheKey, Object o)
    {
        if (o != null)
            HttpContext.Current.Cache.Insert(cacheKey, o, null, DateTime.Now.AddHours(KeepForHours), TimeSpan.Zero);
    }
    public static object Get(string cacheKey)
    {
        return HttpContext.Current.Cache[cacheKey];
    }
    public static void Clear(string sKey)
    {
        HttpContext.Current.Cache.Remove(sKey);
    }
    public static void Clear()
    {
        foreach (DictionaryEntry item in HttpContext.Current.Cache)
        {
            Clear(item.Key.ToString());
        }
    }
}

In methods I want to cache I do this:

[DataObjectMethod(DataObjectMethodType.Select)]
public static SiteSettingsInfo SiteSettings_SelectOne_Name(string Name)
{
    var ck = string.Format("SiteSettings_SelectOne_Name-Name_{0}-", Name.ToLower());
    var dt = (DataTable)SiteCache.Get(ck);
    if (dt == null)
    {
        dt = new DataTable();
        dt.Load(ModelProvider.SiteSettings_SelectOne_Name(Name));
        SiteCache.Set(ck, dt);
    }
    var info = new SiteSettingsInfo();
    foreach (DataRowView dr in dt.DefaultView)
        info = SiteSettingsInfo_Load(dr);
    return info;
 }

Is it possible to separate those concerns like so: (notice the new annotation)

[CacheReturnValue]
[DataObjectMethod(DataObjectMethodType.Select)]
public static SiteSettingsInfo SiteSettings_SelectOne_Name(string Name)
{
    var dt = new DataTable();
    dt.Load(ModelProvider.SiteSettings_SelectOne_Name(Name));

    var info = new SiteSettingsInfo();
    foreach (DataRowView dr in dt.DefaultView)
        info = SiteSettingsInfo_Load(dr);
    return info;
 }