Sitecore 9 Forms : Alphanumeric Captcha As you know Recaptcha is not available on Sitecore 9.0.1 and Sitecore 9.0.2 forms, so I thought to create custom Google Recaptcha but my issue was Google Recaptcha was not working properly on Internet Explorer as it was asking 10 to 15 times to verify which is very frustrating, at the same time it was working for another browser so I thought to create custom Alphanumeric captcha as per client requirement. In previous blog, we have checked how to create Google reCaptcha field. Now we are going to create Alphanumeric Captcha using below steps: Create new viewmodel class AlphaNumericViewModel.cs [Serializable()] public class AlphaNumericViewModel : StringInputViewModel { protected override void InitItemProperties(Item item) { base .InitItemProperties(item); } } Create Controller AlphanumericCaptchaController.cs public class AlphanumericCaptchaController