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The DataSet object is designed with data disconnection in mind and with the assumption that optimistic concurrency is the default In a multiple-user environment, optimistic concurrency occurs when applications do not lock a row while reading it In contrast, a pessimistic form of concurrency involves locking rows at the data source to prevent users from modifying data in a way that affects other users The DataSet object abstracts from the physical data source and qualifies itself as a superarray component capable of containing in-memory data As a container of disconnected data, the DataSet object accepts any sort of update to the rows it contains, so you can add new rows to any child tables, and you can update or delete existing rows All these changes are persisted in memory and are not passed on to a persistent storage medium until an explicit update operation is conducted.

If you want to add a quick total to the data, scroll to the bottom of a column and click the AutoCalc button. Select the type of total you want from the list that opens. The web part inserts a new totals row at the bottom of the datasheet. To remove a field from the display, click and drag the field header off the datasheet. When the pointer includes a red X, drop it. To add fields back to the display, click the Field List button to add fields to the display. Drag the fields you want to see into the datasheet (the web part places the fields into the Column Area).

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To insert your table of contents, place the cursor at the beginning of the first line of your outline. Then click Insert Reference Index and Tables. The Index and Tables dialog box, shown in Figure 2-5, will open. Open the Table of Contents tab. The Print Preview box will show you how the table of contents will appear in final form. Word will not show the actual headings in the Print Preview box. Rather, it shows the position of the different heading levels, substituting Heading 1, Heading 2, and so forth in place of headings. Word has six predefined formats for you to choose. You can also opt to apply text formatting from the document template, which allows you to base the formatting on styles you specify.

Such an update requires a new connection and applies an array of changes in a single shot For this reason, a DataSet update operation is often referred to as a batch update When the batch update is completed, the DataSet in-memory changes are automatically committed to ensure consistency between the in-memory cache and the underlying storage medium As a result, each row of data stored in a DataSet object can have a history of changes that applications might be interested in knowing about and exploiting All this information is irreversibly lost when you serialize a DataSet object to the Microsoft ADONET normal form using the standard option of the WriteXml method (We examined this type of serialization in 9) An alternative XML schema for serializing the contents of a DataSet object is the DiffGram format.

A PivotTable, shown in Figure 9-8, differs from a datasheet in that it offers a threedimensional view of the data.

The DiffGram format of the WriteXml method can provide a stateful representation of the DataSet contents, as opposed to the stateless nature of the normal form Because of its ability to preserve the state of the constituent rows, the DiffGram format is also used to remote a DataSet object through both the Microsoft NET Framework remoting architecture and Web services But let's start by taking a closer look at the structure of a DiffGram script..

A DiffGram is an XML serialization format that includes both the original values and the current values of each row in each table. In particular, a DiffGram contains the current instance of rows with the up-to-date values, plus a section where all the original values for changed rows are grouped. Each row is given a unique identifier that is used to track changes between the two sections of the DiffGram. This relationship looks a lot like a foreign key relationship. The following listing outlines the structure of a DiffGram:. <diffgr:diffgram xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1"> <DataSet> ... </DataSet> <diffgr:before> 361

Figure 9-8. You use the Office PivotTable Web Part to summarize, aggregate, and analyze data in columns and rows.

... </diffgr:before> <diffgr:errors> .. </diffgr:errors> </diffgr:diffgram> The <diffgr:diffgram> root node can have up to three children The first is the DataSet object with its current contents, including newly added rows and modified rows but not deleted rows The actual name of this subtree depends on the DataSetName property of the source DataSet object If the DataSet object has no name, the subtree's root is NewDataSet The subtree rooted in the <diffgr:before> node contains enough information to restore the original state of all modified rows For example, it still contains any row that has been deleted as well as the original contents of any modified row All columns affected by any change are tracked in the <diffgr:before> subtree The last subtree is <diffgr:errors>, which contains information about any errors that have occurred in a particular row.

The predefined formats will save you some time. However, they may not be appropriate for a business plan. If you decide to use one, opt for the Classic format. You are also able to change certain elements in the table of contents. You can alter the appearance of page numbers and leader lines and select how many levels the table of contents will contain. With a professional document such as a business plan, you should emphasize function over form. So design the table of contents with readability in mind. Page numbers are a necessity, so make sure to select Show page numbers. You probably also want to select Right align page numbers. This will give the table a clean, organized look. If you align the page numbers along the right margin, you will do well to add tab leader lines. These lines will guide the reader s eye to the correct page number. Of course, Word provides a few different choices for how the leader lines appear. A dotted leader line is both unobtrusive and effective. Use the drop-down box to select the style you want.

The DataRow class provides a few methods and properties that programmers can use to set an error on any column in the row Errors can be set at any time, not necessarily when the data is entered For example, in distributed applications, it's typical for one user to create some data that another user has to validate In this situation, the reviewer can set an error message on each column of a row to signal that something is wrong with that column Amazingly, the Microsoft Windows Forms DataGrid control then detects any pending errors on displayed rows and marks them with a red exclamation point, providing the user with visual feedback that a particular column contains an error.

In a PivotTable, you can put fields in the Column Area, as in a datasheet, but in addition, you can add fields to the Row Area, and summarize them in the Data Area. You can also add fields to the PivotTable in the Filter Area that allow you to filter the data. Figure 9-9 shows an empty PivotTable ready to receive data fields.

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