CheckBox控件默认选中，提交时永远获得选中状态

写个项目，从数据库中获得的数据绑定值Checkbox，绑定方法如下

//加班设置数据绑定
    protected void CheckBoxBind()
    {
        OverTimeBLL overTimeBll = new OverTimeBLL();
        List<OverTime> overTimeList = new List<OverTime>();

        overTimeList = overTimeBll.GetAll();
        if (overTimeList.Count > 0)
        {
            //绑定页面信息
            txtID.Text = overTimeList[0].ID.ToString();
            if (overTimeList[0].IsEarlyValid.ToLower() == "true") cbIsEarlyValid.Checked = true;
            if (overTimeList[0].IsLaterValid.ToLower() == "true") cbIsLaterValid.Checked = true;
            if (overTimeList[0].IsOnlyHoliday.ToLower() == "true") cbIsOnlyHoliday.Checked = true;
            if (overTimeList[0].IsUseTime.ToLower() == "true") cbIsUseTime.Checked = true;
            if (overTimeList[0].IsUseNum.ToLower() == "true") cbIsUseNum.Checked = true;
            txtMinDuration.Text = overTimeList[0].MinDuration.ToString();
        }
    }

然后在protected void Page_Load(object sender, EventArgs e)方法中加入CheckBoxBind()方法，但提交时，如果某一个CheckBox是选中状态，那获得的永远是该checkBox的checked属性为True，后来再三试了，发现自己疏忽了，只要将CheckBoxBind方法放在if (!this.Page.IsPostBack)下即可。

代码如下

if (!this.Page.IsPostBack)
            {
                remindResult.Text = GetRemind();
                //页面数据绑定
                CheckBoxBind();
            }