效果更好.甚至《印度时报》在右栏中的投票部分中使用了类似的验证码.

看看

It is better. Even Times of India use the similer kind of Captcha in its poll section in right column.

Have a look

请查看以下链接:

ASP.NET中的CAPTCHA图形 [投票"，如果有帮助，请提供"接受答案".
谢谢，
Imdadhusen

Hi,

Please see following link:

CAPTCHA Graphic in ASP.NET[^]

Please do let me know, if you have any doubt.
Please provide "Vote" if this would be helpful, and make "Accept Answer" if this would be useful link.
Thanks,
Imdadhusen