注册失败是什么原因

protected void Button1_Click(object sender, EventArgs e)
    {
        youkexinxi s = new youkexinxi();
        s.ID = yonghuming.Text;
        s.Mima = mima.Text;
        s.Dianhua = zcshouji.Text;
        s.Youxiang = zcyouxiang.Text;
        int ret = s.zhuce();
        if (ret == 1)
            Label1.Text = "注册成功";
        else
            Label1.Text = "注册失败";
    }