using System;
using System.Data;
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.Drawing;
using System.Drawing.Imaging;
using System.IO;
public partial class check : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
// 首先调用RndNum函数生成4位数字的验证码
string str_ValidateCode = RndNum(4);
// 然后把它保存在用于验证的Session里边
Session["ValidateCode"] = str_ValidateCode;
//调用CreateImage函数,把验证码绘制到图片中
CreateImage(str_ValidateCode);
}
本内容试读结束,登录后可阅读更多
下载后可阅读完整内容,剩余3页未读,立即下载