# IsSystemValid(SystemHandle)

> Checks whether a system identified by its system handle exists and is in a valid state

## Definition

* **Type:** Method
* **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md)
* **Assembly:** UnityEngine.EntitiesModule

```csharp
public bool IsSystemValid(SystemHandle id)
```

### Parameters

**** (\[SystemHandle]\(/engine/7000.0/script-reference/unity/entities/systemhandle)): The system handle

### Returns

| Type                                                          | Description                                                          |
| ------------------------------------------------------------- | -------------------------------------------------------------------- |
| [bool](https://learn.microsoft.com/dotnet/api/system.boolean) | True if the system handle identifies a valid system, false otherwise |