1using System;
 2using System.Data;
 3using System.Configuration;
 4using System.Collections;
 5using System.Web;
 6using System.Web.Security;
 7using System.Web.UI;
 8using System.Web.UI.WebControls;
 9using System.Web.UI.WebControls.WebParts;
10using System.Web.UI.HtmlControls;
11using MyOnLineExam.BusinessLogicLayer;
12
13public partial class Web_Login : System.Web.UI.Page
14...{    
15    protected void Page_Load(object sender, EventArgs e)
16    ...{
17        if (!IsPostBack)
18        ...{
19            InitData();//初始化科目列表框
20        }
21    }
22    //初始化考试科目下拉列表框
23    protected void InitData()
24    ...{
25        Paper paper = new Paper();              //创建Paper对象
26        DataSet ds = paper.QueryPaper();        //查询所有可用试卷
27        if (ds.Tables[0].Rows.Count >= 1)
28        ...{                        
29            ddlPaper.DataSource = ds;           //指名考试科目列表框数据源
30            ddlPaper.DataTextField = "PaperName";   //DataTextField显示Name字段值
31            ddlPaper.DataValueField = "PaperID";    //DataValueField显示ID字段值
32            ddlPaper.DataBind();                //绑定数据
33        }
34        else
35        ...{
36            ddlPaper.Enabled = false;
37            imgBtnLogin.Enabled = false;
38            lblMessage.Text = "没有试卷！";
39        }
40    }
41    //登录按钮事件
42    protected void imgBtnLogin_Click(object sender, ImageClickEventArgs e)
43    ...{
44        Users user = new Users();                       //创建Users对象user
45        if (user.CheckPassword(txtUserID.Text.Trim()))  //根据用户编号查询用户密码
46        ...{
47            if (user.UserPwd == txtPwd.Text.Trim())//输入密码与用户密码相同
48            ...{
49                Session["userID"] = txtUserID.Text.Trim();//存储用户编号                
50                Session["PaperID"] = ddlPaper.SelectedValue;
51                Session["PaperName"] = ddlPaper.SelectedItem.Text;               
52                Response.Redirect("UserTest.aspx");    //转向考试界面               
53            }
54            else//密码错误，给出提示
55            ...{
56                lblMessage.Text = "您输入的密码错误！";
57            }
58        }
59        else//用户不存在，给出提示
60        ...{
61            lblMessage.Text = "该用户不存在！";
62        }
63    }
64}
65