'Program.Program()': new protected member declared in sealed type

Cannot convert null literal to non-nullable reference type.

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

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

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

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

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

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

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