'Resource.MEMBERSHIP_BY_ACTIVITY' is obsolete: 'Unused once obsolete routes are removed'

Nullable value type may be null.

Nullable value type may be null.

Possible null reference return.

Possible null reference return.

The result of the expression is always 'false' since a value of type 'int' is never equal to 'null' of type 'int?'

Possible null reference return.

Dereference of a possibly null reference.

Possible null reference return.