# Event Handler

A method or delegate that runs when an event is raised.

## What is **Event Handler** in C#?

**Event Handler** — A method or delegate that runs when an event is raised.

```csharp
class DoorMonitor
{
    void OnDoorOpened(object? sender, EventArgs eventArgs)
    {
    }
}
```

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Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/event-handler