Asp.net(C#)实现验证码功能
新建一个专门用来创建验证码图片的页面ValidateCode.aspx它的后台cs文件代码如下：
PageLoad
<div style="padding-right: 5.4pt; padding-left: 5.4pt; background: #e6e6e6; padding-bottom: 4px; width: 98%; padding-top: 4px;">http://www.cnblogs.com/Images/OutliningIndicators/None.gifprivate void Page_Load(object sender, System.EventArgs e)
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif http://www.cnblogs.com/Images/dot.gif{
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif string checkCode = CreateRandomCode(4);
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif Session["CheckCode"] = checkCode;
http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif CreateImage(checkCode);
http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif }
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