Non-nullable field 'cosXml' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

The variable 'ex' is declared but never used

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Non-nullable field 'UserCodePostfix' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

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