title: Reader writer lock in Azure blob storage
body: <p>I have an Excel file hosted on Azure blob storage for logging usage statistics pertaining to a website. The application accessing the Azure storage is a Web API and makes use of blob reference and memory stream to write data back and forth from the blob <strong>asynchronously</strong>.</p>
  
  <p>Does the asynchronous operation of writing the data back to the blob being handled as part of the reader writer problem e.g. lets say originally there were 10 records and now two users are accessing the blob at the same time. Will the blob be updated to have 12 records in the end?</p>