Web/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 btnLogin_Click(object sender, ImageClickEventArgs e)
    {
        string err="";
        //判断输入
        if (txtUsername.Value == "")
        {
            err += "用户名不能为空!";
        }

        if (txtPass.Value == "")
        {
            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 != "")
        {
           lblMsg.Text=err;
            return;
        }

        DataSet ds = null;
        
        if(DropDownList1.SelectedValue=="管理员")
        {
            BS.BLL.admin bll = new BS.BLL.admin();
            ds = bll.GetList(" lname='" + txtUsername.Value + "' and pwd='" + txtPass.Value + "' and (flag='管理员' or flag='超级管理员') ");
        }
        else if (DropDownList1.SelectedValue == "操作员")
        {
            BS.BLL.admin bll = new BS.BLL.admin();
            ds = bll.GetList(" lname='" + txtUsername.Value + "' and pwd='" + txtPass.Value + "' and (flag='操作员') ");
        }
        else if (DropDownList1.SelectedValue == "读者")
        {
            BS.BLL.users bll = new BS.BLL.users();
            ds = bll.GetList(" uno='" + txtUsername.Value + "' and pwd='" + txtPass.Value + "'");
        }

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