Add project files.

ExtensionMethods.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28307.271
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ExtensionMethods", "ExtensionMethods\ExtensionMethods.csproj", "{75B07550-507F-4D7A-993A-A4D795DF7EB3}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{75B07550-507F-4D7A-993A-A4D795DF7EB3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{75B07550-507F-4D7A-993A-A4D795DF7EB3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{75B07550-507F-4D7A-993A-A4D795DF7EB3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{75B07550-507F-4D7A-993A-A4D795DF7EB3}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {598548FB-E846-4CD3-8249-D04A806B6EFE}
+	EndGlobalSection
+EndGlobal

ExtensionMethods/Controllers/HomeController.cs

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+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using ExtensionMethods.Models;
+using ExtensionMethods.Extensions;
+
+namespace ExtensionMethods.Controllers
+{
+    public class HomeController : Controller
+    {
+        public IActionResult Index()
+        {
+            return View();
+        }
+
+        public IActionResult About()
+        {
+            ViewData["Message"] = "Your application description page.";
+
+            return View();
+        }
+
+        public IActionResult Contact()
+        {
+            ViewData["Message"] = "Your contact page.";
+
+            return View();
+        }
+
+        public IActionResult Privacy()
+        {
+            return View();
+        }
+        public bool IsEmail(string str)
+        {
+            if (string.IsNullOrWhiteSpace(str))
+                return false;
+            return str.IsEmail();
+        }
+        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+        public IActionResult Error()
+        {
+            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
+        }
+    }
+}

ExtensionMethods/ExtensionMethods.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.App" />
+    <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.1.2" PrivateAssets="All" />
+  </ItemGroup>
+
+</Project>

ExtensionMethods/Extensions/StringExtensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+
+namespace ExtensionMethods.Extensions
+{
+    public static class StringExtensions
+    {
+        public static bool IsEmail(this string email)
+        {        
+            if (string.IsNullOrWhiteSpace(email))
+                return false;
+            try
+            {
+                email = Regex.Replace(email, @"(@)(.+)$", DomainMapper,RegexOptions.None, TimeSpan.FromMilliseconds(200));
+                string DomainMapper(Match match)
+                {
+                    var idn = new IdnMapping();
+                    var domainName = idn.GetAscii(match.Groups[2].Value);
+                    return match.Groups[1].Value + domainName;
+                }
+            }
+            catch (RegexMatchTimeoutException e)
+            {
+                return false;
+            }
+            catch (ArgumentException e)
+            {
+                return false;
+            }
+            try
+            {
+                return Regex.IsMatch(email,
+                    @"^(?("")("".+?(?<!\\)""@)|(([0-9a-z]((\.(?!\.))|[-!#\$%&'\*\+/=\?\^`\{\}\|~\w])*)(?<=[0-9a-z])@))" +
+                    @"(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-z][-0-9a-z]*[0-9a-z]*\.)+[a-z0-9][\-a-z0-9]{0,22}[a-z0-9]))$",
+                    RegexOptions.IgnoreCase, TimeSpan.FromMilliseconds(250));
+            }
+            catch (RegexMatchTimeoutException)
+            {
+                return false;
+            }
+        }
+    }
+    }
+

ExtensionMethods/Models/ErrorViewModel.cs

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+using System;
+
+namespace ExtensionMethods.Models
+{
+    public class ErrorViewModel
+    {
+        public string RequestId { get; set; }
+
+        public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+    }
+}

ExtensionMethods/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+
+namespace ExtensionMethods
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateWebHostBuilder(args).Build().Run();
+        }
+
+        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
+            WebHost.CreateDefaultBuilder(args)
+                .UseStartup<Startup>();
+    }
+}

ExtensionMethods/Properties/launchSettings.json

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+{
+  "iisSettings": {
+    "windowsAuthentication": false, 
+    "anonymousAuthentication": true, 
+    "iisExpress": {
+      "applicationUrl": "http://localhost:52989",
+      "sslPort": 44314
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "ExtensionMethods": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "applicationUrl": "https://localhost:5001;http://localhost:5000",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

ExtensionMethods/Startup.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.HttpsPolicy;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace ExtensionMethods
+{
+    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.Configure<CookiePolicyOptions>(options =>
+            {
+                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
+                options.CheckConsentNeeded = context => true;
+                options.MinimumSameSitePolicy = SameSiteMode.None;
+            });
+
+
+            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
+        }
+
+        // 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("/Home/Error");
+                app.UseHsts();
+            }
+
+            app.UseHttpsRedirection();
+            app.UseStaticFiles();
+            app.UseCookiePolicy();
+
+            app.UseMvc(routes =>
+            {
+                routes.MapRoute(
+                    name: "default",
+                    template: "{controller=Home}/{action=Index}/{id?}");
+            });
+        }
+    }
+}

ExtensionMethods/Views/Home/About.cshtml

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+@{
+    ViewData["Title"] = "About";
+}
+<h2>@ViewData["Title"]</h2>
+<h3>@ViewData["Message"]</h3>
+
+<p>Use this area to provide additional information.</p>

ExtensionMethods/Views/Home/Contact.cshtml

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+@{
+    ViewData["Title"] = "Contact";
+}
+<h2>@ViewData["Title"]</h2>
+<h3>@ViewData["Message"]</h3>
+
+<address>
+    One Microsoft Way<br />
+    Redmond, WA 98052-6399<br />
+    <abbr title="Phone">P:</abbr>
+    425.555.0100
+</address>
+
+<address>
+    <strong>Support:</strong> <a href="mailto:[email protected]">Support@example.com</a><br />
+    <strong>Marketing:</strong> <a href="mailto:[email protected]">Marketing@example.com</a>
+</address>

ExtensionMethods/Views/Home/Index.cshtml

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+@{
+    ViewData["Title"] = "Home Page";
+}
+
+<div id="myCarousel" class="carousel slide" data-ride="carousel" data-interval="6000">
+    <ol class="carousel-indicators">
+        <li data-target="#myCarousel" data-slide-to="0" class="active"></li>
+        <li data-target="#myCarousel" data-slide-to="1"></li>
+        <li data-target="#myCarousel" data-slide-to="2"></li>
+    </ol>
+    <div class="carousel-inner" role="listbox">
+        <div class="item active">
+            <img src="~/images/banner1.svg" alt="ASP.NET" class="img-responsive" />
+            <div class="carousel-caption" role="option">
+                <p>
+                    Learn how to build ASP.NET apps that can run anywhere.
+                    <a class="btn btn-default" href="https://go.microsoft.com/fwlink/?LinkID=525028&clcid=0x409">
+                        Learn More
+                    </a>
+                </p>
+            </div>
+        </div>
+        <div class="item">
+            <img src="~/images/banner2.svg" alt="Visual Studio" class="img-responsive" />
+            <div class="carousel-caption" role="option">
+                <p>
+                    There are powerful new features in Visual Studio for building modern web apps.
+                    <a class="btn btn-default" href="https://go.microsoft.com/fwlink/?LinkID=525030&clcid=0x409">
+                        Learn More
+                    </a>
+                </p>
+            </div>
+        </div>
+        <div class="item">
+            <img src="~/images/banner3.svg" alt="Microsoft Azure" class="img-responsive" />
+            <div class="carousel-caption" role="option">
+                <p>
+                    Learn how Microsoft's Azure cloud platform allows you to build, deploy, and scale web apps.
+                    <a class="btn btn-default" href="https://go.microsoft.com/fwlink/?LinkID=525027&clcid=0x409">
+                        Learn More
+                    </a>
+                </p>
+            </div>
+        </div>
+    </div>
+    <a class="left carousel-control" href="#myCarousel" role="button" data-slide="prev">
+        <span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
+        <span class="sr-only">Previous</span>
+    </a>
+    <a class="right carousel-control" href="#myCarousel" role="button" data-slide="next">
+        <span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span>
+        <span class="sr-only">Next</span>
+    </a>
+</div>
+
+<div class="row">
+    <div class="col-md-3">
+        <h2>Application uses</h2>
+        <ul>
+            <li>Sample pages using ASP.NET Core MVC</li>
+            <li>Theming using <a href="https://go.microsoft.com/fwlink/?LinkID=398939">Bootstrap</a></li>
+        </ul>
+    </div>
+    <div class="col-md-3">
+        <h2>How to</h2>
+        <ul>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkID=398600">Add a Controller and View</a></li>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkId=699315">Manage User Secrets using Secret Manager.</a></li>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkId=699316">Use logging to log a message.</a></li>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkId=699317">Add packages using NuGet.</a></li>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkId=699319">Target development, staging or production environment.</a></li>
+        </ul>
+    </div>
+    <div class="col-md-3">
+        <h2>Overview</h2>
+        <ul>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkId=518008">Conceptual overview of what is ASP.NET Core</a></li>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkId=699320">Fundamentals of ASP.NET Core such as Startup and middleware.</a></li>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkId=398602">Working with Data</a></li>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkId=398603">Security</a></li>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkID=699321">Client side development</a></li>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkID=699322">Develop on different platforms</a></li>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkID=699323">Read more on the documentation site</a></li>
+        </ul>
+    </div>
+    <div class="col-md-3">
+        <h2>Run &amp; Deploy</h2>
+        <ul>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkID=517851">Run your app</a></li>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkID=517853">Run tools such as EF migrations and more</a></li>
+            <li><a href="https://go.microsoft.com/fwlink/?LinkID=398609">Publish to Microsoft Azure Web Apps</a></li>
+        </ul>
+    </div>
+</div>

ExtensionMethods/Views/Home/Privacy.cshtml

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+@{
+    ViewData["Title"] = "Privacy Policy";
+}
+<h2>@ViewData["Title"]</h2>
+
+<p>Use this page to detail your site's privacy policy.</p>