Unable to call App_Code class from a code-behind
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1

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I have a class in a file that's in the "App_Code" folder. I'm able to use this in an "aspx" file but not from a code-behind file. How do I make it visible to a code-behind?

NOTE: This is ASP.Net on Mono and I'm writing the classes directly, not using an IDE to compile them

My files:

ASPX FILE (testappcode.aspx)

<%@ Page language="c#" src="TestAppCode.aspx.cs" Inherits="TestAppCode.TestAppCode" AutoEventWireup="true" %>
<html>
  <head>
    <title>Test App_Code Folder</title>
  </head>
  <body>
    <form id="contactForm" runat="server">
    <asp:TextBox id="Name" runat="server" ></asp:TextBox>
    <asp:TextBox id="Age" runat="server" ></asp:TextBox>
    <asp:Button ID="Submit" runat="server" Text="Submit" onclick="SubmitForm" />
    </form>
  </body>
<html>

CODE BEHIND (TestAppCode.aspx.cs)

using System;
using System.Web.UI.WebControls;

namespace TestAppCode
{
    public class TestAppCode : System.Web.UI.Page
    {
    protected void SubmitForm(object sender, EventArgs e)
    {
        //It fails here with the error: CS0246: The type or namespace name
        //`MyAppCodeClass' could not be found. Are you missing a using
        //directive or an assembly reference?
        MyAppCodeClass m = new MyAppCodeClass();
    }
    }
}

APP_CODE CLASS (App_Code/MyAppCodeClass.cs)

public class MyAppCodeClass
{
         public MyAppCodeClass() {}
}

I tried giving it a namespace, but that doesn't fix the issue.

Mizell answered 7/1, 2013 at 22:14 Comment(1)
Duplicate of #1222781Appellate
D
59

Change your class' Build Action to Compile.

enter image description here

Durware answered 7/1, 2013 at 23:51 Comment(3)
Thanks. I was actually writing them by hand (not using VS or MonoDevelop), so compiling the class manually and putting it in the "bin" folder did the same thing.Mizell
Thank you for this piece of information. It saved my day!!Involucre
Superb info. Saved lot of timeLiederkranz

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