About BizTalk Namespace References Included in BizTalk Projects
When you add a new BizTalk project, the following namespaces are included by default:
Microsoft.BizTalk.DefaultPipelines
Microsoft.BizTalk.GlobalPropertySchemas
System
System.Xml
You can also add new references and Web references to your project. For more information about adding references using the Project menu, see Using Visual Studio. For information about adding Web references, see Adding Web References.
Caution
Do not remove the default references. If you remove the default references, you might encounter problems when referencing BizTalk items in your project. You can restore default references in Solution Explorer.
Caution
If your BizTalk project references another assembly, and that assembly is updated, the updates or changes are not automatically picked up in your BizTalk project. You should remove the outdated reference in Solution Explorer, and then add the reference back (re-reference the assembly). Alternatively, you can close your solution and reopen it. In either case, the latest updates to the referenced assembly are available to your project.
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