wher run application and add new page

Question

error:

 

 

Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.

Parser Error Message: Could not load type 'Vas.pages.WebForm2'.

Source Error:

Line 1:  <%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="Vas.pages.WebForm2" %> 
Line 2:  <asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
 Line 3:  </asp:Content>