HRCenter/Diligent.WebAPI.Business/Extensions/HttpExtensions.cs

using System.Text.Json;
using Microsoft.AspNetCore.Http;

namespace Diligent.WebAPI.Business.Extensions
{
    public static class HttpExtensions
    {
        //extension method for setting header in response
        public static void AddHeader(this HttpResponse response, string headerName, int number)
        {
            var options = new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase }; //we want to store content inside header of response in CamelCase format
            response.Headers.Add("Pagination", System.Text.Json.JsonSerializer.Serialize(number, options));
            response.Headers.Add("Access-Control-Expose-Headers", headerName); //giving permission for accessing Pagination header to our client  
        }
    }
}