Possible null reference return.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'xPropertyUpdate' in 'PropSetCollection.PropSetCollection(XElement xPropertyUpdate)'.

Dereference of a possibly null reference.

Converting null literal or possible null value to non-nullable type.

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'Value' in 'PropSet.PropSet(XName Name, object Value)'.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.