public CaptchaService(String text, int width, int height)
 {
     captcha = new Web.Captcha.Captcha(text, width, height);
 }
 public CaptchaService(int length)
 {
     captcha = new Web.Captcha.Captcha(5);
 }
 public CaptchaService(int width, int height, int length)
 {
     captcha = new Web.Captcha.Captcha(width, height, length);
 }