Nullability of reference types in type of parameter 'propertyName' of 'IEnumerable ValidatableBase.GetErrors(string propertyName)' doesn't match implicitly implemented member 'IEnumerable INotifyDataErrorInfo.GetErrors(string? propertyName)' (possibly because of nullability attributes).

Nullability of reference types in type of 'event EventHandler<DataErrorsChangedEventArgs> ValidatableBase.ErrorsChanged' doesn't match implicitly implemented member 'event EventHandler<DataErrorsChangedEventArgs>? INotifyDataErrorInfo.ErrorsChanged'.

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

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

Possible null reference return.

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

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

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

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

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

Nullability of reference types in type of parameter 'propertyName' of 'IEnumerable ValidatableBase.GetErrors(string propertyName)' doesn't match implicitly implemented member 'IEnumerable INotifyDataErrorInfo.GetErrors(string? propertyName)' (possibly because of nullability attributes).

Nullability of reference types in type of 'event EventHandler<DataErrorsChangedEventArgs> ValidatableBase.ErrorsChanged' doesn't match implicitly implemented member 'event EventHandler<DataErrorsChangedEventArgs>? INotifyDataErrorInfo.ErrorsChanged'.

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

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

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

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

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

Possible null reference return.

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

Possible null reference argument for parameter 'obj' in 'void Action<T>.Invoke(T obj)'.

Nullability of reference types in type of parameter 'propertyName' of 'IEnumerable ValidatableBase.GetErrors(string propertyName)' doesn't match implicitly implemented member 'IEnumerable INotifyDataErrorInfo.GetErrors(string? propertyName)' (possibly because of nullability attributes).

Nullability of reference types in type of 'event EventHandler<DataErrorsChangedEventArgs> ValidatableBase.ErrorsChanged' doesn't match implicitly implemented member 'event EventHandler<DataErrorsChangedEventArgs>? INotifyDataErrorInfo.ErrorsChanged'.

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

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

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

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

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

Possible null reference return.

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