Many of you asked me to write a simple “homework” for beginners. Now it’s time to write it down here, so anybody who’s now learning C# and don’t have idea what to code can do this one.

Let’s create a simple vehicle inventory winform application.

The main form should have a ListBox (ListView or GridView for advanced programmers) that will show us the vehicles stored in an kind of database. This database can be SQL, or a simple XML file, CSV file, Local DB, whatever you like. We also need 4 buttons: Add, View, Modify and Remove. Something like this:

Another form will have the details of the selected vehicle when addig, viewing or modifing.

The class structure should be the following:

• create a class of Vehicle. No further programmers could create any instance of this class! (hint: abstraction)
• this Vehicle class should have 5 default properties that will be present in all derived classes:
  • Id (int)
  • CreateUser (string)
  • CreateDate (DateTime)
  • ModifyUser (string)
  • ModifyDate (DateTime)
• these 5 properties should come from and interface of IVehicle
• create 2 subclasses of Vehicle: Air and Ground. These classes shouldn’t be instantiated too!
• create 2 subclasses of Air: Plane and Helicopter.
• create an abstract method in Air class: TotalIncome with returning value of decimal
• the Plane class should have the following properties:
  • plane type (use enum! Values should be Airbus, Boeing, Antonov or anything you like)
  • max number of passangers (int)
  • ticket price (let’s assume that all tickets have the same price for every passangers) (decimal)
  • total distance (double)
• the Helicopter should have the following properties:
  • max number of passangers (int)
  • ticket price (decimal)
  • total distance (double)
  • military or public usage
  • can land on water?
• implement the TotalIncome method that will always return a decimal of (max passangers * ticket price) * (total distance / 10). Of course the result should be shown on the vehicle property form.
• create 2 subclasses of Ground: Car and Bus
• create an abstract method in Ground class: CurrentValue with returning value of decimal
• the Car class should have the following properties:
  • manufacturer (Audi, BMW, Bentley or anything you like. Use enum!)
  • color (use enum)
  • has airconditioner?
  • total distance (double)
  • buying price (decimal)
• the Bus class should have these properties:
  • max number of passangers (int)
  • number of doors (int)
  • total distance (double)
  • buying price (decimal)
• implement the CurrentValue method that equals (buying price – ((total distance / 100) *4))
• create an interface with a method called IncomePerTrip, returns with decimal
• implement this interface in Bus class. Returning value should be (number of passangers * 40.5)
• use only 2 forms! The main form and a property form that would appear anytime a user is doing something in the application (add, view, modify, remove).
• user should add plane, helicopter, car or bus to the database with ONLY relevant properties!
• use confirmation dialog when adding, modifing or removing a vehicle

If this is easy for you, I can extend this homework with some more extra stuff, just let me know! 🙂

Good job!