WISE OWL EXERCISES
VISUAL BASIC EXERCISES
VISUAL BASIC EXERCISES
- Drawing forms (2)
- Form events (1)
- Variables and data types (2)
- Enumerations and constants (2)
- Form validation (3)
- Menus and toolbars (2)
- Files and folders (1)
- Basic DataGridViews (1)
- Reacting to DataGridView events (3)
- Advanced DataGridViews (2)
- Creating classes (4)
- Coding in VB.NET (2)
- Variables and constants (3)
- Testing conditions (2)
- Passing arguments (3)
- Using arrays (2)
- Loops (2)
- Working with files (3)
- Lists (3)
- Creating properties (3)
Visual Basic | Creating classes exercise | Create a shopping list application using VB classes
This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.
The answer to the exercise will be included and explained if you attend the relevant Wise Owl course (sadly, only in the UK for now).
| Software ==> | Visual Basic (46 exercises) |
| Version ==> | Any version of VB |
| Topic ==> | Creating classes (4 exercises) |
| Level ==> | Relatively easy |
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Press CTRL + D to add the file called frmShoppingList.vb from the above folder into your project (or right click on the project and choose to add it as an existing item).
Change your project's properties to make this the default form for your project. When you run your project, you should see this:
The idea is that clicking on the Add item button will make a new item appear in the list on the right.
Create a class called ShoppingList, and create 3 private fields to hold the 3 things being entered:
'private fields for each textbox
Private pItemName As String
Private pUnit As String
Private pAmount As Double
Create one public property for each of these private fields, to expose the value of it to the world.
Attach code to the Add item button which will create a new instance of the ShoppingList class, and make it work (well, soon):
'can now create and add to list new item
Dim thing as New ShoppingItem()
'could use our amount property here
thing.Amount = Convert.ToDouble(txtAmount.Text)
thing.ItemName = txtItem.Text
thing.Unit = txtUnit.Text
thing.Add(txtList)
The only thing left now is to create the Add method for the ShoppingItem class. This should take a TextBox as an argument.
See if your application works!
Here we've added 3 items, and everything seems to be working well.
You are now a VB guru!