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Online data entry property data updating

The reason is because of the manner in which view state is saved as each control records its view state along with the view state of its children controls.

When saving its children controls' view states, each control records the child control's view state along with the ordinal index of the control in the collection.

When the data entry form requirements are well-known in advance, and when such data entry forms are identical across all users for the system, creating such entry forms is hardly challenging.

The task of creating a particular data entry form typically starts with hammering out the requirements that spell out specifically what information needs to be collected from the user.

With the requirements defined, the next stage is designing the data entry Web Form, which involves creating the graphical user interface, as well as writing the code that updates the database with the user's inputs.

The problem with this naive approach is that it requires adding new pages when new products are released.

While creating these new pages might not be terribly difficult, it is time consuming and prone to errors without sufficient debugging and testing time.

All of this, of course, depends on when in the page lifecycle you're adding or removing controls. These references to the Web controls allow for strongly-typed access to the controls, their properties, and their methods.

For a more thorough discussion of view state, the page life cycle, and issues surrounding adding and removing dynamic controls and view state, be sure to read my earlier article Understanding ASP. When working with dynamically-added controls there are a couple of techniques that can be employed to access a control's properties, methods, and events.To programmatically work with a specific dynamically-added control, you can use the is only enumerating the set of children controls or controls in the naming container, and not all descendents of the parent in the control hierarchy. ID = "dyn Text Box" 'At some later point in the page lifecycle, 'reference the dynamic Text Box Dim d TB As Text Box d TB = CType(Place Holder ID.(Furthermore, to search beyond the first level of controls in a naming container, you'll need to use the properly scoped 'When adding the control, set the ID property Dim tb As New Text Box Place Holder ID. Find Control("dyn Text Box"), Text Box) property assigned a unique and identifiable value.If you need more control over the placement of the dynamically added control, you can add a Place Holder Web control to the page, specifying the location in the hierarchy to add one or more dynamic controls.To add the dynamic controls in that location, simply add them to the Place Holder's .Controls Recurse Through Control Hierarchy(child) Next End Sub The above approach works well if you have a number of similar server controls that you need to work with en masse.Oftentimes, though, you might have a gaggle of dissimilar controls that you need to be able to access individually at different times, performing different actions on each control.The role of this auto-generated class is to create the namespace).The control hierarchy is called such because it is an actual hierarchy of controls. NET server control can have a set of child controls and a parent control.For example, consider a company's Internet Web application whose purpose is to collect information about the product purchased by a customer; a sort of online product registration system.With such an application, the questions the user is presented with might differ based on what product they purchased, or if they purchased the product from a store or from the company's Web site.

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