Our Blazor Grid uses the standard DataAnnotationsValidator to validate user input (based on data annotation attributes defined in an edit model). Once a user removes focus from data editors or attempts to submit the edit form, editors are outlined in colors and display validation icons: green for valid values, and red — invalid values. Hover the mouse pointer over an error icon to show the corresponding error message in the title.

When you define the EditFormTemplate, you can use any of the following approaches to display validation messages:

• Use the template context's EditContext property to access the validation message(s) and display it manually.
• Use Blazor's standard ValidationMessage component to display messages for individual data editors.
• Use the ValidationSummary component to summarize validation messages.

You can also implement your custom validator components and declare them in the CustomValidators template. To disable input validation, set the ValidationEnabled option to false.

Note: You should not rely on form validation alone to secure your Blazor-powered app. Form validation is designed to improve usability. A threat actor can bypass validation and send malicious data to the server. To minimize security related threats/risks, you must validate user input using multiple strategies. Refer to the following topic for more information: Validate User Input.