[Expand]General Information
[Expand]WinForms Controls
[Collapse]ASP.NET Controls and MVC Extensions
 [Expand]What's Installed
 [Expand]Common Concepts
 [Expand]ASP.NET WebForms Controls
 [Collapse]ASP.NET MVC Extensions
  [Expand]Product Information
  [Expand]Getting Started
  [Expand]Common Concepts
  [Expand]Grid View
  [Expand]Tree List
  [Expand]Card View
  [Expand]Pivot Grid
   Rich Text Editor
  [Expand]Site Navigation and Layout
  [Expand]HTML Editor
  [Expand]Vertical Grid
  [Collapse]Data Editors
    Editor List
    Main Features
   [Expand]Common Concepts
    [Expand]Visual Elements
    Filter Control
    Validation Summary
   [Expand]Strongly-Typed Editor Types
  [Expand]Docking and Popups
  [Expand]File Management
  [Expand]Data and Image Navigation
  [Expand]Multi-Use Site Extensions
  [Expand]Spell Checker
  [Expand]Query Builder
 [Expand]Redistribution and Deployment
  Get More Help
 [Expand]API Reference
[Expand]ASP.NET Bootstrap Controls
[Expand]ASP.NET Core Bootstrap Controls
[Expand]WPF Controls
[Expand]Xamarin Controls
[Expand]Windows 10 App Controls
[Expand]Office File API
[Expand]Report and Dashboard Server
[Expand]eXpressApp Framework
[Expand]eXpress Persistent Objects
[Expand]CodeRush Classic
[Expand]Cross-Platform Core Libraries
[Expand]Tools and Utilities
 End-User Documentation
View this topic on docs.devexpress.com (Learn more)


The Captcha is a CAPTCHA component used to verify that data is submitted by a human, and not a robot or script.

Expanded Implementation Details

Captcha is realized by the CaptchaExtension class. Its instance can be accessed via the ExtensionsFactory.Captcha helper method, which is used to add a Captcha extension to a view. This method's parameter provides access to Captcha settings implemented by the CaptchaSettings class, allowing you to fully customize the extension.

Captcha's client counterpart is represented by the ASPxClientCaptcha object.

Expanded Declaration

Captcha can be added to a project in the following manner.

View code ("Index.cshtml"):

Partial View code ("_CaptchaPartial.cshtml"):


The Partial View should contain only the extension's code.

The static CaptchaExtension.GetIsValid method is used in the Controller code to check whether the entered code is valid.

Controller code ("HomeController"):

The code result is demonstrated in the image below.

Expanded Main Features

Is this topic helpful?​​​​​​​