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.IO;
using?System.Drawing.Imaging;
using?System.Drawing;
public?partial?class?Image?:?System.Web.UI.Page
{
????protected?void?Page_Load（object?sender?EventArgs?e）
????{
????????string?tmp?=?RndNum（Convert.ToInt16（6））;
????????Session[“verify“]?=?tmp;
????????ValidateCode（tmp）;
????}
????private?void?ValidateCode（string?VNum）
????{
????????Bitmap?Img?=?null;
????????Graphics?g?=?null;
????????MemoryStream?ms?=?null;
????????int?gheight?=?VNum.Length?*?9;
????????Img?=?new?Bitmap（gheight?18）;
????????g?=?Graphics.FromImage（Img）;
????????//背景顏色
????????g.Clear（Color.WhiteSmoke）;
????????//文字字體
????????Font?f?=?new?Font（“Tahoma“?9）;
????????//文字顏色
????????SolidBrush?s?=?new?SolidBrush（Color.Red）;
????????g.DrawString（VNum?f?s?3?3）;
????????ms?=?new?MemoryStream（）;
????????Img.Save（ms?ImageFormat.Jpeg）;
????????Response.ClearContent（）;
????????Response.ContentType?=?“image/Jpeg“;
????????Response.BinaryWrite（ms.ToArray（））;
????????g.Dispose（）;
????????Img.Dispose（）;
????????Response.End（）;
????}
????private?string?RndNum（int?VcodeNum）
????{
????????string?MaxNum?=?““;
????????string?MinNum?=?““;
????????for?（int?i?=?0;?i?????????{
????????????MaxNum?=?MaxNum?+?“5“;
????????}
????????MinNum?=?MaxNum.Remove（0?1）;
????????Random?rd?=?new?Random（）;
????????string?VNum?=?Convert.ToString（rd.Next（Convert.ToInt32（MinNum）?Convert.ToInt32（MaxNum）））;
????????return?VNum;
????}
}