# Sandbox.SandboxSystemExtensions.ToLongEval

```csharp
static long ToLongEval(string expression, long Default = 0)
```

Convert to `T:System.Int64`. Might be a string formula. This is always going to be slower than a call to [Sandbox.SandboxSystemExtensions.ToLong](/api/Sandbox.SandboxSystemExtensions/ToLong).

### Parameters

- `expression` (`string`)
- `Default` (`long`), default `0`

### Returns

`long`

Declared in [Sandbox.SandboxSystemExtensions](/api/Sandbox.SandboxSystemExtensions).
Assembly: `Sandbox.System`.