Channels ▼


Unit Testing the UI

Source Code Accompanies This Article. Download It Now.

Automatic Data Binding

Once you've created a full set of properties in the model and view, you can apply the data binding in the CalculatorForm. In Listing Three, you can bind the Text property of the text box to the Operand2 property of the model, and the Enabled property of the button to the CanDivide property of the model. These bindings enforce that when the Text in the view changes, the model is updated. When the CanDivide property changes, the Divide button is enabled/disabled.

public partial class CalculatorForm : Form
    public CalculatorForm()
        this.Calculator = new Calculator();
    private void InitializeBindings()
        "Enabled", _calculatorBindingSource, 
            "CanDivide", false,
            "Text", _calculatorBindingSource,
            "Operand2", false, DataSourceUpdateMode.OnPropertyChanged);
Listing Three

Related Reading

More Insights

Currently we allow the following HTML tags in comments:

Single tags

These tags can be used alone and don't need an ending tag.

<br> Defines a single line break

<hr> Defines a horizontal line

Matching tags

These require an ending tag - e.g. <i>italic text</i>

<a> Defines an anchor

<b> Defines bold text

<big> Defines big text

<blockquote> Defines a long quotation

<caption> Defines a table caption

<cite> Defines a citation

<code> Defines computer code text

<em> Defines emphasized text

<fieldset> Defines a border around elements in a form

<h1> This is heading 1

<h2> This is heading 2

<h3> This is heading 3

<h4> This is heading 4

<h5> This is heading 5

<h6> This is heading 6

<i> Defines italic text

<p> Defines a paragraph

<pre> Defines preformatted text

<q> Defines a short quotation

<samp> Defines sample computer code text

<small> Defines small text

<span> Defines a section in a document

<s> Defines strikethrough text

<strike> Defines strikethrough text

<strong> Defines strong text

<sub> Defines subscripted text

<sup> Defines superscripted text

<u> Defines underlined text

Dr. Dobb's encourages readers to engage in spirited, healthy debate, including taking us to task. However, Dr. Dobb's moderates all comments posted to our site, and reserves the right to modify or remove any content that it determines to be derogatory, offensive, inflammatory, vulgar, irrelevant/off-topic, racist or obvious marketing or spam. Dr. Dobb's further reserves the right to disable the profile of any commenter participating in said activities.

Disqus Tips To upload an avatar photo, first complete your Disqus profile. | View the list of supported HTML tags you can use to style comments. | Please read our commenting policy.