Web Reference: Use the CustomValidator control to provide a user-defined validation function for an input control. The CustomValidator control is a separate control from the input control it validates, which allows you to control where the validation message is displayed. A common way of using the CustomValidator is when you need to make a database lookup to see if the value is valid. Since this tutorial hasn't treated database access yet, we will do a simpler example, but hopefully you will see that you can do just about everything with the CustomValidator. Feb 23, 2026 · All about custom form validators, including synchronous and asynchronous, field-level, form-level, for both template-driven and reactive forms.
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