保护自定义图像的图像文件名 - 单击CAPTCHA

I'm teaching myself .NET c# through books and self-assigned projects for fun. I thought it could be a good experience to try and create my own image click captcha control from scratch. The kind where you identify "the right image" from a few options and click the right one (the cat or something) to identify yourself as human.I'm teaching myself .NET c# through books and s