Specified blob does not exist

When calling the DownloadByteArray method of the CloubBlob object, I got the error "Specified Blob does not exist". This was my first attempt at serious Cloud programming. I was baffled. Spent the next half an hour looking for clues, replacing \ with / and finally came on to a post on MSDN that stated "Blob names are case sensitive". This was it. I was not using the right case for the blob names and even though the blob existed the method complained that it did not exist.