Hi Biagio,

Your question is unclear. Could you please specify what do you mean by "to check required field"?
In case you would like to use Kendo Validator please check the following resources:

• getting started topic: http://docs.kendoui.com/getting-started/framework/validator/overview
• API reference: http://docs.kendoui.com/api/framework/validator
• demo page: http://demos.kendoui.com/web/validator/index.html
• code library: http://www.kendoui.com/code-library/mobile/application/displaying-validation-summary-in-mobile-application.aspx
• blog post on the topic: http://www.kendoui.com/blogs/teamblog/posts/13-12-10/extending-the-kendo-ui-validator-with-custom-rules.aspx

Regards,
Alexander Valchev
Telerik