Web/login.ascx.cs

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using System;
using System.Collections.Generic;
using System.Data;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class login : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            if (Session["lname"] != null)
            {
                Label1.Text = Session["lname"].ToString();
            }
        }
    }

    /// <summary>
    /// 登录
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (TextBox1.Text == "")
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "<script>alert('用户名不能为空！');</script>");
            return;
        }

        if (TextBox2.Text == "")
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "<script>alert('密码不能为空！');</script>");
            return;
        }

        PSD.BLL.members bll = new PSD.BLL.members();

        DataSet ds = bll.GetList(" lname='" + this.TextBox1.Text + "' and pass='" + this.TextBox2.Text + "'");

        //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["lname"] = dr["lname"].ToString();


            Response.Redirect(Request.Url.ToString());
        }
        else
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "<script>alert('用户名或密码错误，请重试！');</script>");
            return;
        }
    }