# ReaderInput.ReadUInt64

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.buffers.readerinput/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.buffers.readerinput/methods/)

```csharp
public abstract ulong ReadUInt64()
```

Reads a `System.UInt64` from the input.

### Returns

The `System.UInt64` which was read.