default.aspx.cs

本系统实现了网上考试的目的

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 System.Data.SqlClient;

public partial class Login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       
        if (!IsPostBack)
        {
            Session.RemoveAll();
            Random rnd = new Random();
            //生成验证码
            this.Label3.Text = rnd.Next(1000, 9999).ToString();

           
        }
    }
    protected void imbtnLogin_Click(object sender, ImageClickEventArgs e)
    {//登录
        if (tbYZ.Text != Label3.Text)//验证验证码是否正确
        {
            Response.Write("<script lanuage=javascript>alert('验证码错误');location='javascript:history.go(-1)'</script>");
        }
        else
        {
            if (rbStudent.Checked == true)//确定进入的角色,学生登录
            {
                UserDB user = new UserDB();
                String userName = "";
                SqlDataReader recu = user.GetUserLogin(tbUsername.Text.Trim(),tbPassword.Text.Trim(),"2");
                //从数据库取到登录用户的NAME
                if (recu.Read())
                {
                    userName = recu["UserName"].ToString();
                }
                recu.Close();
                if ((userName != null) && (userName != ""))
                {
                    
                        Session["userName"] = userName;
                        Session["UserID"] = tbUsername.Text.Trim();
                        Response.Redirect("StudentPage.htm");
                     
                 }             
                else
                {
                     tbPassword.Text = "";
                     tbUsername.Text = "";
                     Random rnd = new Random();
                     this.Label3.Text = rnd.Next(1000, 9999).ToString();
                     tbYZ.Text = "";
                     Response.Write("<script>alert(\"你的用户名\\密码有误，请重新输入！\")</script>");
                }   
            }
            else if (rbTeacher.Checked == true)//教师登录
            {
                UserDB user = new UserDB();
                String userName = "";
                SqlDataReader recu = user.GetUserLogin(tbUsername.Text.Trim(), tbPassword.Text.Trim(), "1");
                //从数据库取到登录用户的ID
                if (recu.Read())
                {
                    userName = recu["UserName"].ToString();
                }
                recu.Close();
                if ((userName != null) && (userName != ""))
                {

                    Session["userName"] = userName;
                        Session["UserID"] = tbUsername.Text.Trim();

                        Response.Redirect("TeacherPage.htm");
                    
                }
                else
                {
                    tbPassword.Text = "";
                    tbUsername.Text = "";
                    Random rnd = new Random();
                    this.Label3.Text = rnd.Next(1000, 9999).ToString();
                    tbYZ.Text = "";
                    Response.Write("<script>alert(\"你的用户名\\密码有误，请重新输入！\")</script>");
                }   
            }
            else//管理员登录
            {
                UserDB user = new UserDB();
                String userName = "";
                SqlDataReader recu = user.GetUserLogin(tbUsername.Text.Trim(), tbPassword.Text.Trim(), "0");
                //从数据库取到登录用户的ID
                if (recu.Read())
                {
                    userName = recu["UserName"].ToString();
                }
                recu.Close();
                if ((userName != null) && (userName != ""))
                {                   
                   
                        Session["userName"] = userName;
                        Session["UserID"] = tbUsername.Text.Trim();
                        Response.Redirect("ManagerPage.htm");
                    
                }
                else
                {
                    tbPassword.Text = "";
                    tbUsername.Text = "";
                    Random rnd = new Random();
                    this.Label3.Text = rnd.Next(1000, 9999).ToString();
                    tbYZ.Text = "";
                    Response.Write("<script>alert(\"你的用户名\\密码有误，请重新输入！\")</script>");
                }   
            }
        }
    }

    protected void imbtnRegister_Click(object sender, ImageClickEventArgs e)
    {//注册
        Response.Redirect("Register.aspx");
    }
    protected void imbtnCancel_Click(object sender, ImageClickEventArgs e)
    {//关闭网页
        Response.Write("<script language:javascript>javascript:window.close();</script>"); 

    }
    protected void imbtnReinstall_Click(object sender, ImageClickEventArgs e)
    {//重置
        tbUsername.Text = "";
        tbPassword.Text = "";
        tbYZ.Text = "";
        Random rnd = new Random();
        //生成验证码
        this.Label3.Text = rnd.Next(1000, 9999).ToString();
    }
}