expression "bool?"

[Marcel Kloubert]

Hi!

Example:

public bool? IsChecked
{
get { throw new NotImplementedException(); }
}

What does the question mark after the bool mean ("bool?")?

 

[Family Tree Mike]

nullable bool. It can return true, false, or null.

 

[Duy Lam]

It's a shortcut to Nullable<bool>. You can see more about Nullable
struct on MSDN.