login控件重载登陆方法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data.Sql;
using System.Data;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
    {
        //获得登陆控件上是各属性值
        string stdXh = Login1.UserName;
        string password = Login1.Password;
        //生成sql语句和参数对象
        string sql = "select count(*) from stdInfo where stdXh=@stdXh and stdMm=@stdMm";
        SqlParameter[] param ={
                new  SqlParameter("@stdXh",SqlDbType.Char),
                new SqlParameter("@stdMm",SqlDbType.VarChar)
        };
        param[0].Value = stdXh;
        param[1].Value = password;
        //执行SQL语句
        int usercount = ((int)(sqlHelp.ExecuteScalar(sqlHelp.ConnectionStringLcalTransaction, CommandType.Text, sql, param)));
        //判断登陆是否成功
        if (usercount > 0)
        {
            e.Authenticated = true;//设置登录判断变量
            //如果登陆成功，将学号保存在session中，供后面成绩查询页面读取
            Session["stdXh"] = stdXh;
        }
        else
            e.Authenticated = false;//设置登录判断变量
    }
}