Asp.Net 动态生成验证码

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源代码如下：

/// <summary>

/// 验证码模块

/// </summary>

public class CreateImage

{

public static void DrawImage()

{

CreateImage img=new CreateImage();

HttpContext.Current.Session["CheckCode" ]=img.RndNum(4);

img.CreateImages(HttpContext.Current.Session["CheckCode" Ҷƪл˵?