How to do explicit document locks

There is an extension method available to do explicit locking.
Try to call the lock in a using to ensure the lock gets removed in any case.

Note

There is only an async lock method available

public static async Task<Section> DoOperationWithDocumentUsingExplicitLock(Document document)
{
    string clientIdentifier = "SampleDocumentLockApplication";

    DocumentLock customLock = await document.LockAsync((exception) =>
    {
        //Do more useful error handling in production!
        Console.WriteLine(exception.Message);

    }, clientIdentifier, 60);

    //during dispose the document lock will get freed
    using (customLock)
    {
        //Do something with your document, e.g. Add another page to it
        return await document.EasyUploadFileAsync(new FileInfo("Invoice2ndPage.pdf"));
    }
}