Merge pull request #2 from alxnek/master

update my master
Merge pull request #3 from alxnek/DevelopmentAlex

Development alex
adding more gui
class diagram updated2
Finally fixed the checked errors
Merge branch 'master' of https://github.com/motherdear/CSharp_CarDealer

Conflicts:
	CarDealer.suo
Merge pull request #4 from alxnek/master

can i pull
Merge pull request #12 from motherdear/master

GUI work :3