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In this chapter, we explored the Office web parts, a dynamic way to display and work with data from a variety of sources in a SharePoint site. The Office Spreadsheet Web Part is a useful tool for your online data entry needs, and the Office PivotTable Web Part gives you tremendous power to display, analyze, and aggregate data. Office Datasheets give you flexibility in displaying, sorting, and filtering data, letting you and your users slice and dice data any way you want to see it. Office PivotCharts present a dynamic graphical view of data. Finally, the Office PivotView Web Part lets users decide how they want to see the data. By adding any or all of these web parts to a SharePoint web part page, you can create exciting dashboards that keep site users up to date with all the current trends by turning raw data into sources of useful information. In 10, we take the concept of web parts a step further as we explore how to build custom web parts that are designed to solve your specific business problems.

{ // Url is a form property that points to the DiffGram file object o1=null, o2=null, o3=null, o4=null; WebBrowserNavigate(Url, ref o1, ref o2, ref o3, ref o4); } A DiffGram has no trace of relationships between tables unless the Nested property of the DataRelation object is set to true This system is reasonable in light of what we saw in 9 ADONET serializes information about tables relationships using XML Schema constructs Because a DiffGram does not include schemas, it can't contain static information about table relationships When the Nested property is set to true, the parent/child relationship is expressed by grouping child rows as a subtree of the parent row Persisting a DataSet Object to a DiffGram A DiffGram is programmatically created by calling the WriteXml method of the DataSet class.

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ou ve seen many of the web parts that are included with SharePoint in previous chapters, in which we ve used SharePoint web parts to create web part pages. In the last chapter, you learned to create a simple Spreadsheet web part by adding one directly to a web part page from the Web Part Gallery on a Windows SharePoint Services site. In this chapter, we add another tool for Excel and SharePoint integration: the Windows SharePoint Services Spreadsheet Web Part Add-in for Excel 2003. An Excel add-in is a special type of workbook saved using the XLA extension. Add-ins extend the functionality of Excel, and an add-in usually includes code but can also include worksheets. When you open an add-in, it isn t displayed like a normal workbook. It s added to the current workbook s Project Explorer, visible only in the Visual Basic Editor. Most add-ins are password protected; you can see them in Project Explorer, but you cannot view or modify the code. Several Excel add-ins are available on the Microsoft site. You can create your own add-ins simply by saving an Excel workbook using the Add-in file type. With the Windows SharePoint Services Web Part Add-in for Excel 2003, you can create your own web parts in Excel to perform custom calculations or retrieve and display data using an Extensible Markup Language (XML) map. If you haven t worked with XML maps in Excel, you ll find all the information you need to get started in Appendix B.

To save data to a DiffGram, however, you must explicitly set the XmlWriteMode argument of the method to the flag XmlWriteModeDiffGram, as shown in the following code The XML data created in this way does not include schema information We'll return to this important point in the section "Schema Information in the DiffGram," on page 461 // Prepare the output stream StreamWriter sw = new StreamWriter(fileName); XmlTextWriter writer = new XmlTextWriter(sw); writerFormatting = FormattingIndented; // Create the diffgram dsWriteXml(writer, XmlWriteModeDiffGram); writerClose(); The DiffGram contains all the rows from all the tables found in the DataSet object You can create ad hoc subsets of the DataSet object to narrow the information being saved In particular, you can use the DataSet object's GetChanges method to save only those rows that contain uncommitted changes, as shown here: DataSet dsChanges = dsGetChanges(); dsChangesWriteXml(writer, XmlWriteMode.

DiffGram); The GetChanges method also has a few overloads that let you control the type of changes you are interested in For example, the following code prepares a DiffGram containing only the rows that have been inserted: DataSet dsChanges = dsGetChanges(DataRowStateAdded); dsChangesWriteXml(writer, XmlWriteModeDiffGram); Loading a DataSet Object from a DiffGram When you try to build a DataSet object from an XML DiffGram, you must first ensure that the target DataSet object has a schema that is compatible with the data in the DiffGram 374.

The default settings for the Normal.dot template are 1 inch at the top and bottom of the page and 1.25 inches at either side of the page. In most situations, these settings are appropriate for a business plan. However, if you plan to bind the business plan, you may want to increase the left margin by .25 inch. This ensures that the binding will not obstruct any of the printing.

Note The Spreadsheet Web Part Add-in for Excel 2003 is still being tested (the version used in this chapter is Beta 2). If you download a newer version, the look and feel and the features might be slightly different than is shown in this chapter. Don t let this discourage you; this add-in has been in Beta 2 for almost a year, and many people are using it to create custom web parts.

In no case does the ReadXml method the only DataSet method that can load a DiffGram infer the schema or extend with new elements an existing schema ReadXml works by merging the rows read from the DiffGram with existing rows in the DataSet object The DiffGram row identifier (the diffgr:id attribute) is used to pair DiffGram and DataSet object rows Any incompatibility between the current schema of the DataSet object and the data in the DiffGram throws an exception and causes the merge operation to fail As a result, you can't load a DiffGram into an empty, newly created DataSet object You can create the target DataSet object simply by cloning an existing object that you know has the correct schema Or, more realistically, you might want to read the schema from an external support using the ReadXmlSchema method.

The following code snippet shows how to create a DiffGram and its schema in distinct files: // Prepare the output stream for the DiffGram StreamWriter diffStrm = new StreamWriter(diffgramFile); XmlTextWriter writer = new XmlTextWriter(diffStrm); writerFormatting = FormattingIndented; // Create the diffgram from the ds DataSet dsWriteXml(writer, XmlWriteModeDiffGram); writerClose(); // Prepare the output stream for the schema StreamWriter xsdStrm = new StreamWriter(schemaFile); XmlTextWriter writer = new XmlTextWriter(xsdStrm); writerFormatting = FormattingIndented; // Create the schema from the ds DataSet dsWriteXmlSchema(writer); writerClose(); The schema written with WriteXmlSchema is an XML Schema and includes table, relation, and constraint definitions Schema Information in the DiffGram In general, the schema and the data should be kept in separate files and handled as truly independent entities.

The simple Payment Calculator web part shown in Figure 10-1 lets the user enter information about the length of the loan, interest rate, and principal, then returns the monthly payment. The user can select other cells, such as the monthly payment, but

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