IDocumentManager.CheckOutDocument Method

Puts the document into the checked-out state.

void CheckOutDocument(
IDocument document
);

Only one user can check out a document at a time.

Exception Type	Condition
PermissionDeniedException	The user does not have permission to check-out the document, or the document is already checked out by another user.
CollaborationException	The method call resulted in an error or the user does not have access to the document.
SoapException	There is a communication problem during the execution of the remote method call.
InvalidOperationException	The document has not yet been inserted or has already been removed.