Recently, we came across the following issue when attempting to sign a VSTO Add-In with a code-signing certificate: An error occurred while signing: Unknown error "-2147012865" Any search of the error message brought up related answers but not ones specific to this particular error number. Although I can't be sure of the error number, I... Continue Reading →
Concurrent IO read or write operations with HTTPWebRequest
Recently when using the HTTPWebRequest class to stream a file up to a SharePoint Online Document Library, I was consistently coming across the following issue: System.NotSupportedException: The stream does not support concurrent IO read or write operations. What was really annoying about that message is, I was not doing any concurrent operations but passing blocks of... Continue Reading →