Watch the Chromtastic online guitar lesson by Bill Evans from 30 Sax Licks for Guitar You MUST Know
Play the first bar and then hold the last note, the C#, and then play that in all keys. A fun way to practice a line like this is to pick 4 notes in a group, and play them in all keys. There are virtually an unlimited number of lines that you can create out of this one line. Chromatic swing lines can go anywhere, in any key. Notice how the 4th bar brings it home and back into the key? That's the key - bringing it back to the main key.