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Implementing Two-Way Control Binding for Web Forms : Page 6

ASP.NET's native data binding provides only one-way data binding. With a little bit of effort, it's possible to extend the native functionality and provide flexible two-way data binding and a few other simple enhancements that drastically reduce the amount of code you have to write for binding data to controls.


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Error Display
This next method creates an array of BindingErrorobjects containing information about the error. You can configure custom binding error messages by setting a binding error message on the control (see Figure 4). Otherwise, the code in Listing 7 assigns a generic error message to the property.

Reflection makes it possible to dynamically read and assign property values that were assigned at design time. You can think of it as a simple evaluation mechanism.
This array of binding errors, if any, is returned from the Unbind operation. A couple of helper methods exist to turn the array into HTML. The code for the Inventory example you saw earlier looks something like this:

... BindingError[] Errors = wwWebDataHelper.FormUnbindData(this); if (Errors != null) { this.ShowErrorMessage( wwWebDataHelper.BindingErrorsToHtml(Errors) ); return; } if (!Inventory.Save()) ...

In addition, each of the controls contains some custom code to display error information, as shown in Figure 5.



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