Possible null reference return.

Non-nullable field 'Port' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Dereference of a possibly null reference.

Possible null reference assignment.

Possible null reference return.

Possible null reference return.

Possible null reference argument for parameter 'item' in 'void List<string>.Add(string item)'.

Non-nullable field 'filtereddata' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

The variable 'ex' is declared but never used