INT422 Internet III Web Programming on Windows

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INT422 Internet III Web Programming on
Windows

• Data Binding

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What is data binding?

• Three-step process
• Establish path to a data source (server)
• Request specific data
• Move the data into a repeating control (binding)

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Use a SqlDataSource control

• Does not have a GUI component
• It is a data object

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Configure the DataSource

• Just like GUI web controls is many ways
• Launches a wizard to help you define all the
  aspects of the DataSource

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Choose from existing or new connection
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Creating a new connection
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Saving the connection details(in your web.config)
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Select what data you wish to get
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Perhaps filtered to reduce data
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And organized by order
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Preview results
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Add a repeating web control

• Listbox
• DropDownList
• CheckboxList
• RadioButtonList
• GridView
• Repeater
• etc.

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Select the Data Source for the control
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Choose what goes where
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When the page loads, data binds
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Data selection can be parameterized

• Where can be linked to other control(s) that
  supply value for data filter
• Need to declare a new DataBind method invocation
  on the web control
• For deeper control, use data controls (future
  topic) or ObjectDataSource

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Bindable controls

• Not only display data can be DataBound
• Many bindable controls handle colour, visibility,
  images and many other bindable properties
• This makes theming easy by binding to common
  style elements using other kinds of data sources
  other than database-related data, like themes