?using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using MyOnLineExam.BusinessLogicLayer;

public partial class Web_Login : System.Web.UI.Page
{    
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            InitData();//初始化科目列表框
        }
    }
    //初始化考試科目下拉列表框
    protected void InitData()
    {
        Paper paper = new Paper();              //創建Paper對象
        DataSet ds = paper.QueryPaper();        //查詢所有可用試卷
        if (ds.Tables[0].Rows.Count >= 1)
        {                        
            ddlPaper.DataSource = ds;           //指名考試科目列表框數據源
            ddlPaper.DataTextField = "PaperName";   //DataTextField顯示Name字段值
            ddlPaper.DataValueField = "PaperID";    //DataValueField顯示ID字段值
            ddlPaper.DataBind();                //綁定數據
        }
        else
        {
            ddlPaper.Enabled = false;
            imgBtnLogin.Enabled = false;
            lblMessage.Text = "沒有試卷！";
        }
    }
    //登錄按鈕事件
    protected void imgBtnLogin_Click(object sender, ImageClickEventArgs e)
    {
        Users user = new Users();                       //創建Users對象user
        if (user.CheckPassword(txtUserID.Text.Trim()))  //根據用戶編號查詢用戶密碼
        {
            if (user.UserPwd == txtPwd.Text.Trim())//輸入密碼與用戶密碼相同
            {
                Session["userID"] = txtUserID.Text.Trim();//存儲用戶編號                
                Session["PaperID"] = ddlPaper.SelectedValue;
                Session["PaperName"] = ddlPaper.SelectedItem.Text;               
                Response.Redirect("UserTest.aspx");    //轉向考試界面               
            }
            else//密碼錯誤，給出提示
            {
                lblMessage.Text = "您輸入的密碼錯誤！";
            }
        }
        else//用戶不存在，給出提示
        {
            lblMessage.Text = "該用戶不存在！";
        }
    }
}