猩猩将军擎天柱合体:ASP.NET的Session传值问题，请大家帮帮忙，先谢谢了

我是ASP.NET的初学者，在使用SESSION传值的时候出现“用户代码未处理”错误，提示我“使用NEW关键字创建对象实例”，请问是怎么会事啊？先谢谢大家了，代码如下：

A：
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

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

}
protected void btm_ok_Click(object sender, EventArgs e)
{
Session["uid"] = TextBox1.Text;
Session["pwd"] = TextBox2.Text;
}
}

B：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class log : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string uid;
string pwd;

uid = Session["uid"].ToString();
pwd = Session["pwd"].ToString();

if (uid == pwd)
{
Label1.Text = "登陆成功！";
}
else
{
Label1.Text = "登陆失败！";
}
}
}