What's the difference between “bool” and “bool?”?

Question

I use the \"bool\" type for variables as I was used to in C++, and I try to put the values of functions or properties I expect to be boolean into my variable. However I ofte

Answer 1

bool means you can have values of true and false. bool? means you can have a value of true, false, and null.

It works for datetime and booleans.

Answer 2

bool? means the boolean is nullable and is syntactic sugar for a stucture Nullable<bool>. Because a boolean is a value type, you cannot set it to null, but there are some cases where you'd want to like in a data access class because database fields can have null values.