Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using EmpManagement.Models;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace EmpManagement
{
    public class Startup
    {
        private IConfiguration _config;

        public Startup(IConfiguration config)
        {
            _config = config;

        }
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddDbContext<AppDbContext>(options => options.UseSqlServer(_config.GetConnectionString("EmpDBConnection")));

            services.AddIdentity<IdentityUser, IdentityRole>()
                .AddEntityFrameworkStores<AppDbContext>();
            services.AddMvc();
            services.AddScoped<IEmployeeRepository, SQLEmployeeRepository>();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
               app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
                app.UseStatusCodePagesWithReExecute("/Error/{0}");
            }
        
            app.UseStaticFiles();
            app.UseAuthentication();
            //app.UseMvcWithDefaultRoute();
            app.UseMvc(routes =>
            {
                routes.MapRoute("default", "{controller=Home}/{action=index}/{id?}");
            });
           
           
        }
    }
}