“当前上下文中”名称'XXX'不存在“从旧文件复制

Question

我从一个旧程序中复制了一些代码并将其复制到一个新程序中，它正在工作，但现在我的所有对象都有这个错误：

The name 'XXX' does not exist in the current context

我确定它与代码文件背后丢失与html的链接有关，但我看到的所有文件名和引用都匹配。有什么特别值得我检查的吗？提前谢谢！

来自html文件

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="garrettPenfieldUnit4.Default" %>

<。>来自.cs文件

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

namespace garrettPenfieldUnit4
{
    public partial class Default : System.Web.UI.Page
    {
        //Load events, automatically inserts todays date and selects the single king radio button
        protected void Page_Load(object sender, EventArgs e)
        {
            arrivalDateBox.Text = DateTime.Today.ToShortDateString();
            singleKingButton.Checked = true;
        }

        //When submit button is clicked show the two confirmation labels.
        protected void submitButton_Click(object sender, EventArgs e)
        {
            submitLabel1.Visible = true;
            submitLabel2.Visible = true;
        }

        //When the clear button is clicked clear the form and reset fields to their default values
        protected void clearButton_Click(object sender, EventArgs e)
        {
            arrivalDateBox.Text = DateTime.Today.ToShortDateString();
            departureDateBox.Text = String.Empty;
            peopleDropDown.SelectedIndex = 0;
            singleKingButton.Checked = true;
            twoQueensButton.Checked = false;
            singleQueenButton.Checked = false;
            specialRequestsBox.Text = String.Empty;
            firstNameBox.Text = String.Empty;
            lastNameBox.Text = String.Empty;
            addressBox.Text = String.Empty;
            telephoneNumberBox.Text = String.Empty;
            contactDropDown.SelectedIndex = 0;
        }
    }
}