login.aspx.cs

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using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using dao;
public partial class login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    /// <summary>
    /// 登陆
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btn_Ok_Click(object sender, EventArgs e)
    {
         string err = "";

        //判断输入
        if (txt_lname.Text == "")
        {
            err += "用户名不能为空!";
        }

        if (txt_pwd.Text == "")
        {
            err += "密码不能为空!";
        }

        //验证输入，如果不合法就弹出相应提示，并返回
        if (err != "")
        {
            Response.Write("<script>javascript:alert('"+err+"!');</script>");
            return;
        }

        DataTable ds = null;

     
            ds =  DBHelper.GetDataSet("select * from yonghu where yhm='" + txt_lname.Text + "' and mm='" + txt_pwd.Text + "'");
      

        //判断用户是否存在
        if (ds.Rows.Count > 0)
        {
            DataRow dr = ds.Rows[0];

            //把用户信息存入到Session
          
                Session["yhid"] = dr["yhid"].ToString();
                Session["yhm"] = dr["yhm"].ToString();