The namespace name doesnt exist

The connection class Is static and I am getting this error. Any idea why.

The type or namespace name 'ConnectionClass' does not exist in the namespace 'WebSite2.App_Code' (are you missing an assembly reference?) C:\Users\Me\Documents\Visual Studio 2013\Projects\WebSite2\WebSite2\Pages\Coffee.aspx.cs 21 54 WebSite2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Collections;
using System.Text;

namespace WebSite2.Pages
{
    public partial class Coffee : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        private void FillPage()
        {
            ArrayList coffeeList = WebSite2.App_Code.ConnectionClass.GetCoffeeByType(!IsPostBack ? "%" : DropDownList1.SelectedValue);
            StringBuilder sb = new StringBuilder();