myBook.Web/webAdmin/Login.aspx.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using myBook.Model;
using myBook.BLL;
//下载于51aspx.com

public partial class webAdmin_Login : System.Web.UI.Page
{
    adminBLL abll = new adminBLL();

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            GetRam();
        }
    }

    /// <summary>
    /// 验证码
    /// </summary>
    public void GetRam()
    {
        string num = "";

        Random r = new Random();
        num = (r.Next(1000, 9999)).ToString();
        Session["num"] = num;
        this.LinkButton1.Text = num;
    }

    /// <summary>
    /// 登录
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {

        if (yzm.Text == "")
        {
            ScriptManager.RegisterStartupScript(this.UpdatePanel1, this.GetType(), "key", "<script>alert('请填写验证码');</script>", false);
            return;
        }

        if (Session["num"] == null)
        {
            GetRam();
            ScriptManager.RegisterStartupScript(this.UpdatePanel1, this.GetType(), "key", "<script>alert('验证码错误');</script>", false);
            return;
        }

        if (yzm.Text != Session["num"].ToString())
        {
            GetRam();