using System; using Microsoft.AspNet.Builder; namespace ErrorPageSample { public class Startup { public void Configure(IApplicationBuilder app) { app.UseErrorPage(); app.Run(context => { throw new Exception(string.Concat( "Demonstration exception. The list:", "\r\n", "New Line 1", "\n", "New Line 2", Environment.NewLine, "New Line 3")); }); } } }