Attachments

Example: Remove all attachments with the name "DevSupport" from a card 
var card = trello.Cards.WithId("a card id");
foreach (var attachment in card.Attachments.Where(a => a.Name == "DevSupport"))
    trello.Cards.RemoveAttachment(card, attachment);

There are two ways to upload an attachment, either using a file path:
```csharp
trello.Cards.AddAttachment(card, new FileAttachment(@"C:\temp\image.jpg", "An image"));

Or an array of bytes:

trello.Cards.AddAttachment(card, new BytesAttachment(
    File.ReadAllBytes(@"C:\temp\image.jpg"), "An image", "image.jpg"));