# Sandbox.SandboxSystemExtensions.ToULong

```csharp
static ulong ToULong(string str, ulong Default = 0)
```

Convert to `T:System.UInt64`, if not then return `Default`.

### Parameters

- `str` (`string`)
- `Default` (`ulong`), default `0`

### Returns

`ulong`

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