The KeyStates class is a bit field (flagwise) enumeration. Therefore, a key can be in multiple states. For example, a key could be in the Down state as well as in the Toggled state. Use bit operations to determine the exact state or states the key is in.
The following example changes the color of a Button if the KeyStates of the key passed in the KeyEventArgs is Down. The state of the key is determined by using a bitwise AND operation. The same technique can be used to determine whether a key has multiple states, such as being in the Toggled state and the Down state.