Can not find the class referenced in the tag

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ASP.NET

C#3.5

I inherited a project with no documentation. Here is the code I have a question about:

Page Name is Main.aspx

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Main.aspx.cs" Inherits="MyWebPage.WebForm2"%>
<%@ Register assembly="Microsoft.ReportViewer.WebForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" namespace="Microsoft.Reporting.WebForms" tagprefix="rsweb" %>ng="ASP.NET">

I can not find a class or referenced assembly called WebForm2.

This page only works on one server.

How can I see this Webform2 class? Where do I find it? I tried to create a new main page but the class it inherits was named MyNewPage.

Any help is appreciated.

What I have tried:

Google search, recreate the page