Exercise: Create a shopping list application using VB classes

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The answer to the exercise will be included and explained if you attend the Wise Owl course listed below!

Category ==> Visual Basic 2010  (42 exercises)
Topic ==> Creating classes  (1 exercise)
Level ==> Relatively easy
Course ==> Adv VB | Classes & LINQ
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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:

Shopping list dialog box

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!

Shopping list in use

Here we've added 3 items, and everything seems to be working well.

You are now a VB guru! 

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