The type or namespace name 'WebHostBuilder' could not be found

I've created empty asp.net core project and I want to set up there angular. For that I need app to serve static files. So my Startup.cs looks:

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.Extensions.DependencyInjection; using Microsoft.Extensions.Logging; namespace coreng { public class Startup { public void Configure(IApplicationBuilder app) { app.UseDefaultFiles(); app.UseStaticFiles(); } } } 

program.cs

using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Threading.Tasks; using Microsoft.AspNetCore.Hosting; namespace coreng { public class Program { public static void Main(string[] args) { var host = new WebHostBuilder() .UseKestrel() .UseContentRoot(Directory.GetCurrentDirectory()) .UseIISIntegration() .UseStartup<Startup>() .Build(); host.Run(); } } } 

and there's my project.json

{ "dependencies": { "Microsoft.NETCore.App": { "version": "1.0.0", "type": "platform" }, "Microsoft.AspNetCore.Diagnostics": "1.0.0", "Microsoft.Extensions.Logging.Console": "1.0.0", "Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final", "Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final", "Microsoft.AspNet.StaticFiles": "1.0.0-rc1-final", "Microsoft.AspNetCore.StaticFiles": "1.0.0" }, "tools": { "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final" }, "frameworks": { "netcoreapp1.0": { "imports": [ "dotnet5.6", "portable-net45+win8" ] } }, "buildOptions": { "emitEntryPoint": true, "preserveCompilationContext": true }, "runtimeOptions": { "configProperties": { "System.GC.Server": true } }, "publishOptions": { "include": [ "wwwroot", "web.config" ] }, "scripts": { "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ] } } 

But it throws an error:

Severity Code Description Project File Line Suppression State Error CS0246 The type or namespace name 'WebHostBuilder' could not be found (are you missing a using directive or an assembly reference?) coreng..NETCoreApp,Version=v1.0

C:\Users\username\Documents\Visual Studio 2015\Projects\coreng\src\coreng\Program.cs 14 Active

What's wrong?