# ErrorProvider

The Wisej.NET `ErrorProvider` indicates control errors to users. When an error is specified, an icon appears beside the control, flashing according to the `BlinkStyle` and `BlinkRate` settings. Hovering over the icon reveals a tooltip with the error description.

For data-bound controls, the `ErrorProvider` requires a specified `ContainerControl`, set either through the constructor or the `ContainerControl` property.

{% hint style="info" %}
For a full list of properties, methods and events see the [API documentation.](http://docs.wisej.com/api)
{% endhint %}

## Features

### Validation

The `ErrorProvider` displays alert messages when detecting invalid input.

![ErrorProvider showing validation message](/files/-Mf51lcebR4MH6rB3HaW)

## Advanced

### JavaScript Widget

| Item        | Description                                                                                                         |
| ----------- | ------------------------------------------------------------------------------------------------------------------- |
| Class name  | "wisej.web.extender.ErrorProvider"                                                                                  |
| Source code | [https://github.com/iceteagroup/wisej-js](https://github.com/iceteagroup/wisej-js/blob/master/wisej.web.TextBox.js) |


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