The type or namespace name 'App_Code' does not exist in the namespace WebApplication1

Question

_{Thursday, November 1, 2018 5:15 PM}

Using Visual Studio 2015 I perform the following actions...

1) New Project: ASP.Net Empty Web Application, WebApplication1
2) Add new web form, WebForm1.aspx
3) Create new folder, App_Code
4) Add new class, Class1.cs to App_Code folder.  Its namespace is created as WebApplication1.App_Code
5) Add "using WebApplication1.App_Code" to WebForm1.aspx.cs

A red line appears under the text, "App_Code" in the using statement showing the error in the subject of this post.

I then changed the namespace for Class1 to be the same as the web form, WebApplication1 and instantiated a Class1 variable inside WebForm1.Page_Load() and it gets a red line saying, Class1 doesn't exist in this context.

What am I missing?  This is stuff I've been doing successfully for years... 

How do I declare a class in my App_Code folder and then actually use it in a Web Form?

Thanks!

Curt

All replies (1)

_{Thursday, November 1, 2018 7:25 PM ✅Answered}

Select Class1 in Solution Explorer, right-click, go to Properties (or press <F4>) and make sure that Build Action is “Compile”.