Asp.net web app, how can I share classes with all code-behind files?

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C#

ASP.NET4

Hello-

I inherited an asp.NET application written in C#. It is not a project and not associated with a solution; it is simply a collection of aspx files and their associated aspx.cs files.

It's a programming mess, and I'm trying to rewrite it using class objects. They work fine, but I have to put the classes in each code-behind page; this is clearly not right.

Newbie question, sorry, but how can I place my classes in a single myClasses.cs file and let my other aspx.cs code-behind files use them? I've looked at a hundred different posts on this, but I can't seem to get at this one very simple question.

I've tried a lot of things, and sometimes Intellisense sees my classes while coding, but then my application errors out when I try to run it.

Any help is appreciated.

What I have tried:

My class:

<pre>public class BasePage : System.Web.UI.Page
{
    public int YourMethod(string str)
    {
        int someNum = 1;
        return someNum;
    }
}

And then to access it from another page:

<pre>public class Default : BasePage
{
      protected void Page_Load(object sender, EventArgs e)
      {
          // You can use YourMethod here
      }
}

I've also tried a bunch of variations on this.