## AttachmentBase.ContentId property

Gets or sets the content ID of the part, by which HTML refers to it with a `cid:` URL.

```csharp
public string ContentId { get; set; }
```

### Property Value

The content ID.

### See Also

* class [AttachmentBase](../)
* namespace [Aspose.Email](../../attachmentbase/)
* assembly [Aspose.Email](../../../)