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;

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

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        string err = "";

        //判断输入
        if (this.textfield1.Value == "")
        {
            err += "用户名不能为空!";
        }

        if (this.textfield2.Value == "")
        {
            err += "密码不能为空!";
        }
        string qx = this.qx.Text;
        //验证输入，如果不合法就弹出相应提示，并返回
        if (err != "")
        {
            MessageBox.Show(this, err);
            return;
        }

        DataSet ds = new DataSet();

       
            ds = SqlHelper.ExecuteforDataSet("select * from yonghu where yhm='" + this.textfield1.Value + "' and mm='" + this.textfield2.Value + "' and qx='"+qx+"'");
      
        //判断用户是否存在
        if (ds.Tables[0].Rows.Count > 0)
        {
            DataRow dr = ds.Tables[0].Rows[0];

            //把用户信息存入到Session

            Session["yhid"] = dr["yhid"].ToString();
                Session["yhm"] = dr["yhm"].ToString();
                Session["mm"] = dr["mm"].ToString();
                Session["qx"] = dr["qx"].ToString();
          

            //跳转到后台
            Response.Redirect("index.html");