Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.UI.Services;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using OrgDocs.Data;
using OrgDocs.Utility;

namespace OrgDocs
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            

            services.AddDbContext<OrgDocsContext>(
                options => options.UseSqlServer(Configuration.GetConnectionString("OrgDocsContextConnection")));
            services.AddIdentity<IdentityUser, IdentityRole>().AddEntityFrameworkStores<OrgDocsContext>().AddDefaultTokenProviders();
            services.AddSingleton<IEmailSender, EmailSender>();

            services.Configure<EmailOptions>(option =>
            {
                option.SendGridKey = Environment.GetEnvironmentVariable("sendgridKey", EnvironmentVariableTarget.User);
                option.SendGridUser = Environment.GetEnvironmentVariable("sendgridUser", EnvironmentVariableTarget.User);
            });

            services.AddControllersWithViews();
            services.AddRazorPages();

        }


        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }
            app.UseHttpsRedirection();
            app.UseStaticFiles();

            app.UseRouting();

            app.UseAuthentication();
            app.UseAuthorization();
            

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Home}/{action=Index}/{id?}");
                endpoints.MapRazorPages(); //new
            });
        }
    }
}