If you want to run this example from VS.NET project you need to change in file cs_inside_usercontrol.ascx the following line
<%@ Control Language="c#" Src="cs_inside_usercontrol.ascx.cs" Inherits="EM_Examples.cs_inside_usercontrol" %>
to
<%@ Control Language="c#" CodeBehind="cs_inside_usercontrol.ascx.cs" Inherits="EM_Examples.cs_inside_usercontrol" %>