# Sandbox.UI.Drag.Start

```csharp
DropAction Start()
```

Start the drag. Blocks while the user drags it around - the panel windows keep
painting through it - and returns what the receiver did with the payload once
they let go. None when it was cancelled or nothing was carried.

### Returns

`DropAction`

Declared in [Sandbox.UI.Drag](/api/Sandbox.UI.Drag).
Assembly: `Sandbox.Engine`.