Create Generic Handler to load js/ css files with caching

This sample code below help us to implement loading data with caching support

context.Response.Write(response.ToString());
string version = GetVersion(); //your dynamic version number 
context.Response.ContentType = "text/css"; // "text/javascript" 

context.Response.AddFileDependencies(files.ToArray());

// define cache info 

HttpCachePolicy cache = context.Response.Cache; 

cache.SetCacheability(HttpCacheability.Public); 

cache.VaryByParams["param"] = true; // cache depend on what parameter

cache.SetETag(version); 

cache.SetLastModifiedFromFileDependencies(); 

cache.SetMaxAge(TimeSpan.FromDays(14)); 

cache.SetRevalidation(HttpCacheRevalidation.AllCaches);