BWPM/App_sik/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.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System.IO;
using Newtonsoft.Json.Serialization;
using Newtonsoft.Json;
using Newtonsoft;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.NewtonsoftJson;
using Microsoft.AspNetCore.Http;

namespace sf1
{
    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.AddDistributedMemoryCache();
            
          
          
                        
            services.AddControllersWithViews();
            services.AddDistributedMemoryCache(); //This way ASP.NET Core will use a Memory Cache to store session variables
            services.AddSession(options =>
            {
                options.IdleTimeout = TimeSpan.FromDays(1); // It depends on user requirements.
                options.Cookie.Name = ".My.Session"; // Give a cookie name for session which will be visible in request payloads.
            });
            services.AddRazorPages();
            services.AddHttpContextAccessor();
            services.AddMvc().AddNewtonsoftJson(options =>
            {
                options.SerializerSettings.ContractResolver = new DefaultContractResolver();
            });

        }

        // 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.UseSession();
            app.UseHttpsRedirection();
            app.UseStaticFiles();
            app.UseRouting();

            app.UseAuthorization();
           
            
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Home}/{action=Index}/{id?}");
            });
			if (Directory.Exists(Path.Combine(Directory.GetCurrentDirectory(), @"node_modules",@"@syncfusion")))
            {
                if (!Directory.Exists(Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", @"js", @"ej2")))
                {
                    Directory.CreateDirectory(Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", @"js", @"ej2"));
                    File.Copy(Path.Combine(Directory.GetCurrentDirectory(), @"node_modules", @"@syncfusion", @"ej2-js-es5", @"scripts", @"ej2.min.js"), Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", @"js", @"ej2", @"ej2.min.js"));
                }

                if (!Directory.Exists(Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", @"css", @"ej2")))
                {
                    Directory.CreateDirectory(Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", @"css", @"ej2"));
                    File.Copy(Path.Combine(Directory.GetCurrentDirectory(), @"node_modules", @"@syncfusion", @"ej2-js-es5", @"styles", @"bootstrap.css"), Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", @"css", @"ej2", @"bootstrap.css"));
                    File.Copy(Path.Combine(Directory.GetCurrentDirectory(), @"node_modules", @"@syncfusion", @"ej2-js-es5", @"styles", @"bootstrap4.css"), Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", @"css", @"ej2", @"bootstrap4.css"));
                    File.Copy(Path.Combine(Directory.GetCurrentDirectory(), @"node_modules", @"@syncfusion", @"ej2-js-es5", @"styles", @"material.css"), Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", @"css", @"ej2", @"material.css"));
                    File.Copy(Path.Combine(Directory.GetCurrentDirectory(), @"node_modules", @"@syncfusion", @"ej2-js-es5", @"styles", @"highcontrast.css"), Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", @"css", @"ej2", @"highcontrast.css"));
                    File.Copy(Path.Combine(Directory.GetCurrentDirectory(), @"node_modules", @"@syncfusion", @"ej2-js-es5", @"styles", @"fabric.css"), Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", @"css", @"ej2", @"fabric.css"));
                }
            }
        }
    }
}