Allow Cross Site Json Attribute

AllowCrossSiteJsonAttribute.cs

public class AllowCrossSiteJsonAttribute : ActionFilterAttribute
  {
		public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
		{
			if (actionExecutedContext.Response != null)
				actionExecutedContext.Response.Headers.Add("Access-Control-Allow-Origin", "*");

			base.OnActionExecuted(actionExecutedContext);
		}
	}