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have barely scratched the surface in terms of the total amount of work that needs to be done! The next step is determining the structure of the main data source and the names of its elds and groups Since we ve already created an unstructured version of the data source by dragging all of the controls into the view, this step is mostly a matter of moving and renaming elds However, we need to consider some other data source changes to support the visual design of the form One such change in the data source, for example, is related to having a wizard-like form We want the user to continue to the next view only if the current view is free of validation errors (We ll see how to check for form errors in the Adding Form Code section later in this chapter) The easiest way to achieve such behavior is to gather all data source elds and groups that you want to validate under a common parent This is easiest to do by creating groups that map to the views in the form In our case, only the Welcome and Request Details views collect data from users Once we create groups that correspond with these views, we can move each node into its appropriate group Another task of data source editing involves renaming the generic node names ( eld1, group1, and so on) to something meaningful Remember the text labels we created for the newly inserted controls when visually setting up the form We ve found it easiest to mimic those names in the eld or group name with PascalCasing Many bene ts are realized by properly naming data source nodes One bene t that we didn t realize until it just worked is displaying the raw eld names to the user to identify speci c errors (as shown earlier in Figure 1519) Another big win is hooking up the context-sensitive help in the custom task pane As you can see, naming your nodes properly can make form development easier when you add advanced form features.



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lnorder traversal is similar to postorder, except that a node is declared visited when it is popped for the second time

private void OnCountryToValidated(object sender, EventArgs e) { m_ExchangeRatesBindingSourceEndEdit(); }

The inorder traversal is the same as the postorder traversal, except that a node is declared visited after it is popped a second time Prior to returning, the iterator pushes the right child (if it exists) onto the stack so that the next call to advance can continue by traversing the right child Because this action is so similar to a postorder traversal, we derive the Inorder class from the Postorder class (even though an IS-A relationship does not exist) The only change is the minor alteration to advanceThe new class is shown in Figure 1829





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While you re renaming data source nodes, also consider whether they cannot be blank and whether the data type should be more restrictive For data types such as integer, you can click the Format button to de ne a display format If you re not sure, you can always change the properties later, but it s quicker to make changes in a single pass

Preorder is the same as postorder, except that a node is declared visited the first time it is popped The right and then left children are pushed prior to the return

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The preorder traversal is the same as the inorder traversal, except that a node is declared visited after it has been popped the first time Prior to returning, the iterator pushes the right child onto the stack and then pushes the left child Note the order: We want the left child to be processed before the right child, so we must push the right child first and the left child second We could derive the Preorder class from the Inorder or PostOrder class, but doing so would be wasteful because the stack no longer needs to maintain a count of the number of times an object has been popped Consequently, the PreOrder class is derived directly from TreeIteratorThe resulting class interface with the constructor and f i r s t method is shown in Figure 1830 At line 2 3 , we added a stack of pointers to tree nodes to the TreeIterator data fields The constructor and first methods are similar to those already presented As illustrated by Figure 1831, advance is simpler: We no longer need a for loop As soon as a node is popped at line 15, it becomes the current node We then push the right child and the left child, if they exist

What if you want to use some data in your form but really don t have anywhere to put it (such as the form version or cache ID) Consider adding that data node under the document element In our case, let s add FormVersion, CacheId, and SavedFileLocation as attribute elds to the document element These elds aren t edited by the user, yet they re set through form code and are displayed to the user

In a level-order traversal, nodes are visited top to bottom, left to right Levelorder traversal is implemented via a queue The traversal is a breadth-first search

Storing sensitive data in the main data source is not recommended, even if you are not displaying the elds in the view Simply saving the form and viewing the content in a text editor (unless the form uses Information Rights Management) will reveal all form data in plain text

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