This ASP.NET MVC filter attribute is used to mark an action method whose output response will not be cached.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Mvc;
using System.Web;

namespace Mvc
{
    /// <summary>
    /// Action filter which disables response caching
    /// </summary>
    public class NoCacheAttribute : FilterAttribute, IActionFilter
    {
        /// <summary>
        /// Called after the action method executes
        /// </summary>
        /// <param name="filterContext"></param>
        public void OnActionExecuted(ActionExecutedContext filterContext)
        {
            return;
        }

        /// <summary>
        /// Called before an action method executes
        /// </summary>
        /// <param name="filterContext"></param>
        public void OnActionExecuting(ActionExecutingContext filterContext)
        {
            HttpContext.Current.Response.Cache.SetExpires(DateTime.UtcNow.AddDays(-1));
            HttpContext.Current.Response.Cache.SetValidUntilExpires(false);
            HttpContext.Current.Response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
            HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
            HttpContext.Current.Response.Cache.SetNoStore();
        }

    }
}

// In ASP.NET Core
// https://github.com/johnstaveley/SecurityEssentials/blob/master/SecurityEssentials/Core/Attributes/NoCacheAttribute.cs

using System;
using System.Web;
using System.Web.Mvc;

namespace SecurityEssentials.Core.Attributes
{
	/// <summary>
	/// SECURE: Apply this to any controller where the data is sensitive and should not be cached locally
	/// </summary>
	[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
	public sealed class NoCacheAttribute : ActionFilterAttribute
	{
		public override void OnResultExecuting(ResultExecutingContext filterContext)
		{
			filterContext.HttpContext.Response.Cache.SetExpires(DateTime.UtcNow.AddDays(-1));
			filterContext.HttpContext.Response.Cache.SetValidUntilExpires(false);
			filterContext.HttpContext.Response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
			filterContext.HttpContext.Response.Cache.SetCacheability(HttpCacheability.NoCache);
			filterContext.HttpContext.Response.Cache.SetNoStore();

			base.OnResultExecuting(filterContext);
		}
	}
}