Page 171 - DCAP312_WEB_TECHNOLOGIES_II

Unit 8: Creating More Advanced ASP.NET

foreach (DataBindingRegister dbR in Notes
this.dataBindingCollection)
{
Control control = dbR.ControlObject;
if (control.ID != null) {
if (this.Direction ==
BindingDirection.FromUIToBusinessObject)
{
control.DataBind();
}
else if (bindingDirection ==
BindingDirection.FromBusinessObjectToUI)
{
PropertyInfo propertyInfo = control.GetType().
GetProperty(dbR.ControlObjectPropertyName,
BINDING_FLAGS);
object obj = propertyInfo.GetValue(control, null);
propertyInfo = this.BusinessEntity.GetType().
GetProperty(dbR.BusinessObjectPropertyName,
BINDING_FLAGS);
propertyInfo.SetValue(
this.BusinessEntity, obj, null);
}
}
}
return this.BusinessEntity;
}
The preceding example calls the Bind() method twice: once in the Page_Load event and once in
the Button Click event. The Binding Direction enum will hold one of two values: either From
Business Object To UI or From UI To Business Object.
That completes the application. Upon execution, it displays the default data bound to the
controls in the Page_Load event. And if you enter new values in the text boxes and then click
on the Button control, the form displays the name and address entered in the text boxes after a
postback. In both cases, the data binding takes place using the Bind() method, which executes
once in each direction.

Data binding in ASP.NET 1.x was unidirectional, i.e., the control could in no way update the
underlying data source to which it was bound. While ASP.NET 2.0 introduced two-way data
binding, not all the ASP.NET controls supported i; you need to write custom data binding logic
such as that discussed in this topic to make two-way data binding available for all the controls.

Create a two way binding application.

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