Caching in ASP.net

Question

I m having a webService. In that I m using Caching.

I have wrote following code to store datatable in cache.

using System.Web.Caching;

Cache.Insert("dt", dt, null, DateTime.Now.AddHours(1), TimeSpan.Zero, System.Web.Caching.CacheItemPriority.Default, null);

It give me error like "An object Reference is required for non static field.

How can i remove this error

Answer 1

Use System.Web.HttpRuntime.Cache.Insert(...). This 'Cache' is a property returning an instance of System.Web.Caching.Cache. It's the same as HttpContext.Current.Cache, but without requiring an HttpContext.

Your code was trying to access a method of that class, without using an instance - thus the error message.

Answer 2

You're trying to use Cache class as an static one.

If you want to use current Cache class instance for an HTTP context during a request, you should be doing something like:

HttpContext.Current.Cache.Insert("dt", dt, null, DateTime.Now.AddHours(1), TimeSpan.Zero, System.Web.Caching.CacheItemPriority.Default, null);