Cache DB Call

cacheDBCall.cs

if (HttpContext.Current.Cache.Get("ef_results") == null)
{
    var results = null; // todo: get results from EF
    HttpContext.Current.Cache.Add("ef_results", // cache key
                                  results, // cache value
                                  null, // dependencies
                                  System.Web.Caching.Cache.NoAbsoluteExpiration, // absolute expiration
                                  TimeSpan.FromMinutes(30)); // sliding expiration
}

myDropDown.DataSource = HttpContext.Current.Cache.Get("ef_results");