Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Possible null reference assignment.

Nullability of reference types in type of parameter 'sender' of 'anonymous method' doesn't match the target delegate 'EventHandler<KeyPressedEventArgs>' (possibly because of nullability attributes).

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

Possible null reference return.

Possible null reference argument for parameter 's' in 'int int.Parse(string s)'.

Possible null reference return.

The variable 'e' is declared but never used