Hello World! Part Three

This Walkthrough Tutorial will show you how to create an Application from scratch. This part assumes that you already read Part One & Part Two

In this part we will see how to:

1. Extend the Domain model with a new class associated with an existing
2. Extend existing form with new associated class

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Create association between classes

At ProductBO:

• Create one more class
• Name the class Category
• Insert Name as attribute (data type: string)
• Hover the Product class close to borders
• When the cursor turns into a cross, click and drag the line until it reaches class Category
• A modal is displayed

Configure Association Properties as:

• A Product can have zero or one category
• Many Products can have the same category
• On delete of a product, the related category is disassociated
• A category cannot be deleted if there is a related product
• Click OK

Create Category forms using wizzard

Use wizzard to bootstrap Master & Detail forms for Class Category

Add related class to existing form

Open ProductForm

• Select Model on the right
• Right click at property Product
• Select Add Related Classes

• A modal is displayed
• Select Category class
• Click OK

Add a dropdown

• From Toolbox find the Dropdown control and insert at the canvas
• Select it

From Properties, at DATA section:

• Bind the dropdown to Category

• Create a dataset (from Category class & the operation GetAll)

• Click on the Display & Value Options

A modal is displayed:

• Select Name for Display Member
• Select Category for Value Member
• Click OK

• Save, validate and Build the application

At the runtime, the user will be able to select the product category

Speed up using Wizard

At Model

• Navigate to Category
• Drag & Drop it inside the Body

On drop, select as Dropdown

Select the dropdown. As you can notice at Properties wizard created everything needed

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Remember

Remember to Save, Validate and Build the application