Control 'rbl_shipment' referenced by the ControlToValidate property of 'rbl_shipmentRequired' cannot be validated.
1 Answer, 1 is accepted
answered on 12 Jan 2017, 02:04 PM
RadButton and any other components from the button family (like RadPushButton, RadCheckBoxButton and so on) does not support the RequiredFieldValidator. This behavior is the same for the native ASP button components as well and conceptually cannot be validated using a RequiredFieldValidator.
The only button-related components that, by design, should support the RequiredFieldValidator integration are CheckBoxList and RadioButtonList controls. However, this functionality will be available with the next release of the Telerik UI for ASP.NET AJAX suite. You can find more information about that in this feedback item: https://feedback.telerik.com/Project/108/Feedback/Details/208616.