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The following listing shows a sample DiffGram in which row 1 has been modified, row 2 has been deleted, row 3 has an error, and a new row has been added: <diffgr:diffgram xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1"> <NorthwindInfo> <Employees diffgr:id="Employees1" msdata:rowOrder="0" diffgr:hasChanges="modified" employeeid="1" lastname="Davolio" firstname="Michela" /> <Employees diffgr:id="Employees4" msdata:rowOrder="3" diffgr:hasErrors="true" employeeid="4" lastname="Peacock" firstname="Margaret" /> <Employees diffgr:id="Employees10" msdata:rowOrder="9" diffgr:hasChanges="inserted" employeeid="10" lastname="Esposito" firstname="Dino" /> </NorthwindInfo> <diffgr:before> 362.

Figure 9-9. In an Office PivotTable Web Part, you can add fields to the Column, Row, Data, and Filter Areas.

<Employees diffgr:id="Employees1" msdata:rowOrder="0" employeeid="1" lastname="Davolio" firstname="Nancy" /> <Employees diffgr:id="Employees2" msdata:rowOrder="1" employeeid="2" lastname="Fuller" firstname="Andrew" /> </diffgr:before> <diffgr:errors> <Employees diffgr:id="Employees3" diffgr:Error="Check out the first name!!!" /> </diffgr:errors> </diffgr:diffgram> Some of the attributes and nodes that form a DiffGram come from a couple of Microsoft proprietary namespaces The default prefixes are msdata and diffgr In particular, the msdata namespace contains a number of attributes that are annotations for the data in the stream We'll look at these attributes and the entire structure of the DiffGram in the section "DiffGram Format Annotations," on page 448 The Current Data Instance The first section of the DiffGram represents the current instance of the data Although it's not strictly mandatory from a syntax standpoint, of the three constituent subtrees, the data instance is the only subtree that you will always find in a DiffGram A DiffGram without data is just the representation of an empty DataSet object.

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The <diffgr:before> and <diffgr:errors> subtrees are not present if the source DataSet object has no pending changes and errors A DiffGram is stateful and is like a superset of the ADONET XML normal form The data instance is nearly identical to the normal form, which is a simple, stateless snapshot of data The major difference between the DiffGram's data instance and the normal form is that the DiffGram format does not include schema information To make the overall DiffGram format truly stateful, you must combine the data with two other subtrees the original data and the pending errors By combining the contents of the three subtrees, a client can rebuild a faithful representation of the original DataSet contents Note Like the normal form, not even the DiffGram can be considered a serialization format for the DataSet as an object.

Note Switching between predefined formats may change the other options in the dialog box. So if you

To begin building a PivotTable, click Show Field List on the toolstrip. Drag fields from the field list to the appropriate areas.

The DiffGram is a serialization format for the contents of a DataSet object To be a valid serialization of the DataSet object itself, the DiffGram would need to contain schema information Incidentally, the implementation of the ISerializable interface that both the DataSet object and the DataTable object provide manages to return a special version of the DiffGram format that differs from this because it incorporates schema information You'll learn how to build DiffGram documents that contain a schema in the section "The DiffGram Viewer Application," on page 457..

Data Generator Objects As mentioned, the data subtree in a DiffGram is similar to the ADO.NET normal form for XML we looked at in 9. In both cases, the XML code being generated by the WriteXml method represents a snapshot of the data currently stored in the DataSet 363

Note Just a reminder that if you re unfamiliar with PivotTables, we recommend that you study them in

object's tables. The data written out faithfully tracks any pending updates and deletions that have occurred in the meantime. As Figure 10-1 shows, the similarity between the first block of a DiffGram and the XML normal form is not just cosmetic, nor it is due to a mere chance.

Excel before attempting to work with them in SharePoint. Although they re basically the same, Excel offers extensive help on how to work with PivotTables.

Figure 10-1: Components that work under the hood of the DataSet object's WriteXml method. The same internal component, the XML tree writer, is used to generate both the ADO.NET XML normal form and the data instance block in a DiffGram. A pleasant side effect of this architecture is that all the mapping features for DataColumn objects we examined in 9 (see the discussion of the MappingType enumeration in the section "Customizing the XML Representation," on page 411) are still valid in the context of a DiffGram. You can decide whether a given column is better rendered using an attribute or an element, or whether the column should be hidden altogether. The Hidden Flag The MappingType.Hidden flag reveals a slight difference in the XML code that WriteXml generates for DiffGrams. A column mapped as hidden text is still part of DiffGram's data instance, but qualified with a particular attribute, as shown here: <diffgr:diffgram xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1"> <NorthwindInfo> <Employees diffgr:id="Employees1" msdata:rowOrder="0" msdata:hiddenemployeeid="1"> <lastname>Davolio</lastname> 364

Finally, use the Show levels drop-down box to select how many heading levels to show. Moderation is best. However, you want your reader to find the relevant section easily. When you ve specified the options for the table, click OK. Your table of contents appears at the top of the document, above the document outline.

<firstname>Nancy</firstname> </Employees> ... </NorthwindInfo> </diffgr:diffgram> For example, assume that you marked the employeeid column as hidden, as shown here: DataColumn col = ds.Tables["Employees"].Columns["employeeid"]; col.ColumnMapping = MappingType.Hidden; The employeeid column is not rendered as an <employeeid> element or an employeeid attribute, but a custom attribute is always used. The name of this attribute is hiddenXXX, where XXX represents the name of the column in this case, hiddenemployeeid. The new attribute belongs to the msdata namespace. Note In the context of the DiffGram, the msdata:hiddenXXX attribute is a full replacement for the hidden column in other words, the information is not hidden at all, but the name of the column is a bit camouflaged.

To group items, select the items in the Row Area you want to group. If they re noncontiguous, hold Ctrl to select the items. Right-click the selection and choose Group. The PivotTable displays the group to the left of the column. To change the name of the group, follow these steps: 1. Click the Commands and Options button on the toolbar. 2. Click the Captions tab. 3. Click the item in the PivotTable you want to rename and then enter a new name in the Caption text box. You can use this method to rename any fields.

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