# GH_BorderTopology enum

Namespace: [Grasshopper.GUI.Canvas](https://developer.rhino3d.com/api/gh1/namespace/grasshopper.gui.canvas.md) · Assembly: [Grasshopper](https://developer.rhino3d.com/api/gh1/assembly/grasshopper.md)

```cs
public enum GH_BorderTopology
```

Enumerates all possble border types.

## Values

| Name | Value | Description |
| --- | --- | --- |
| None | -2 | Unset value. |
| All | -1 | All possible types. |
| TopRight | 0 | Corner border in the top right area of the box. |
| TopLeft | 1 | Corner border in the top left area of the box. |
| BottomLeft | 2 | Corner border in the bottom left area of the box. |
| BottomRight | 3 | Corner border in the bottom right area of the box. |
| Top | 4 | Edge border along the top area of the box. |
| Left | 5 | Edge border along the left area of the box. |
| Bottom | 6 | Edge border along the bottom area of the box. |
| Right | 7 | Edge border along the right area of the box. |