Programmatic way to download CRM attachments

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We have some sample code on this topic being released in the next rev of the SDK samples (coming very soon!). In the meantime, since I have been asked about this a few times, here is a simple piece of code that shows how to download CRM attachments using the .NET WebClient class. Needless to mention that Uploading attachments programmatically through web services is a new feature in CRM V3.0.

using System.Net;

//NOTE: AttachmentType represents the type of the attachment: 1001 for ActivityMimeAttachment, 5 for Annotation and 1070 for SalesLiteratureItem.

//This is the ID of the attachement that you are trying to download

string myAttachementId = "{00000000-0000-0000-0000-00000000000}";

string url = "https://localhost/Activities/Attachment/download.aspx?AttachmentType=5&AttachmentId=" + myAttachementId;

WebClient myWebClient = new WebClient();

myWebClient.Credentials = CredentialCache.DefaultCredentials;

myWebClient.DownloadFile(url,"C:\myfile");