HomeController.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using AwsSecretStoreAspNetCore.Models;
using Microsoft.Extensions.Configuration;
using AwsSecretStoreAspNetCore.Models.Home;

namespace AwsSecretStoreAspNetCore.Controllers
{
    public class HomeController : Controller
    {
        private readonly IConfiguration _config;
        public HomeController(IConfiguration config)
        {
            _config = config;
        }

        public IActionResult Index()
        {
            var vm = new IndexViewModel
            {
                Secret = _config.GetValue<string>("test:ConnectionStrings:DATABASE"),
            };
            return View(vm);
        }

        public IActionResult Privacy()
        {
            return View();
        }

        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Error()
        {
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
        }
    }
}

Index.cshtml

@{
    ViewData["Title"] = "Home Page";
}

<div class="text-center">
    <h1 class="display-4">Welcome</h1>
    <p>Learn about <a href="https://docs.microsoft.com/aspnet/core">building Web apps with ASP.NET Core</a>.</p>
    <p>Secret: @Model.Secret</p>
</div>

IndexViewModel.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace AwsSecretStoreAspNetCore.Models.Home
{
    public class IndexViewModel
    {
        public string Secret { get; set; }
    }
}