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The DataRow Error Programming Interface The tables in this section provide a quick overview of the properties and methods available in the DataRow class for setting and getting error messages. These messages are then tracked in the <diffgr:errors> section of the DiffGram. Table 10-5 lists the error-related properties of the DataRow class. Table 10-5: Error-Related DataRow Properties Property Description HasErrors Indicates whether the row contains errors RowError Gets or sets a custom error description for the row

If you cite outside sources in your business plan, it is important to credit them properly with footnotes. Word automates the process so the numbering is always correct. If you make changes to the document, you don t need to worry about the placement of the footnotes. To insert a footnote, place the cursor where you want to position the footnote mark. Then click Insert Reference Footnote. In the Location section in the Footnote and Endnote dialog box, select Footnotes and specify Bottom of page, as shown in Figure 2-8. Click Insert.

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The HasErrors property is set to true when either the RowError property contains a value or at least one column is not associated with an empty message. If you want to know about all the columns with errors, use the GetColumnsInError method to obtain an array containing the DataColumn objects with errors. Table 10-6 shows the error-related methods of the DataRow class. Table 10-6: Error-Related DataRow Methods Method Description Clears all the pending errors for the row. Does not ClearErrors distinguish between errors set using RowError and errors set using SetColumnError. GetColumnError Gets the error description for the specified column. GetColumnsInError SetColumnError Returns an array of the DataColumn objects with errors. Sets the error description for the specified column.

Figure 9-15. Use the Advanced properties to limit the users ability to move or close the web part.

Contents of the <diffgr:errors> Section A table row is assigned an element in the <diffgr:errors> section if its HasErrors property returns true. In this case, the element that represents the row in the data section has an extra attribute, diffgr:hasErrors, as shown here: <Employees diffgr:id="Employees1" msdata:rowOrder="0" diffgr:hasErrors="true"> <employeeid>1</employeeid> <lastname>Davolio</lastname> <firstname>Nancy</firstname> </Employees> The preceding element is coupled with another element in the <diffgr:errors> section in which the error messages are tracked, as follows: 371

<diffgr:errors> <Employees diffgr:id="Employees1" diffgr:error="Must review"> <employeeid diffgr:error="Check the ID" /> <lastname diffgr:error="Sounds like the wrong name" /> </Employees> </diffgr:errors> The diffgr:error attribute on the row node (<Employees> in the preceding sample code) contains the text stored in the RowError property. For each column with a custom error description, a new child element is created with the name of the column and a diffgr:error attribute. In the sample code, the employeeid and lastname columns contain errors. Note that the RowError property is not automatically filled when at least one column is in error. Caution The XML schema of the elements in the <diffgr:errors> section is not affected by column mappings, as is the case with the current data and the <diffgr:before> sections we examined earlier.

The Spreadsheet and PivotView options vary depending on whether the web part is a Spreadsheet or a PivotView Web Part. Figure 9-16 shows the PivotView properties.

Word will insert the footnote mark at the selected location and take you to the footnote section at the bottom of the page (see Figure 2-9). There, you can enter the footnote text. Add formatting as you would for any other portion of your document.

To fully demonstrate the workings of XML DiffGrams, nothing is better than taking a DataSet object, entering some changes, and seeing how the corresponding DiffGram representation varies. For this purpose, I created the DiffGram Viewer Windows Forms application, shown in Figure 10-3. The application is available in this book's sample files.

When you ve finished modifying properties, close the task pane to take you back out of design view.

Figure 10-3: The DiffGram Viewer sample application in action. This application executes a couple of SQL commands to obtain a DataSet object filled with two tables Employees and Territories. The names of the DataSet object and the in-memory tables can be changed at will using text boxes. Next the application creates a relation between the tables, sets the nesting property to true, and creates the DiffGram. 372

The DiffGram is created using an in-memory string writer, and the output text is written to a multiline, read-only text box. Clicking the Edit button opens a new form with a DataGrid control for editing rows. The DataGrid control is bound to the DataSet object generated by the query, and is shown in Figure 10-4.

Summary

Figure 10-4: At the end of the editing phase, the updated DataSet object is resaved as a DiffGram and the pending changes are displayed. The child form allows you to set errors and enter any type of changes. When the form is dismissed, the main application automatically saves the bound DataSet object back to a DiffGram and refreshes the user interface. As a result, you can easily test the DiffGram and view how the output varies after data changes. A nice feature of the DiffGram Viewer application is that it lets you toggle the DiffGram view between plain text and XML. The XML view is provided by Internet Explorer, as shown in Figure 10-5.

Now you are ready to specify the page setup for the entire document. You may decide later to alter the page setup in specific parts of your business plan. Or you may already know that the page setup will differ in certain areas. That is okay. For now, you are setting the predominant page layout for your business plan. Access the Page Setup dialog box by clicking File Page Setup. Click the Margins tab to open the settings for the margins, as shown in Figure 2-10.

Figure 10-5: The DiffGram displayed in Internet Explorer. The DiffGram Viewer application makes use of the WebBrowser ActiveX control, which is imported almost seamlessly by Microsoft Visual Studio .NET. The following code shows how to refresh such a Web view. To view the DiffGram using the WebBrowser control, the DiffGram must first be saved to disk as a temporary XML file. void RefreshWebBrowser() 373

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