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to differentiate between the initial display of a page and a subsequent submission. But in the case of Web Parts, a postback also occurs when a team member uses a browser to add, remove, or reconfigure any Web Part on the page. This makes sense if you stop and think about it. There are many times such as when you use a browser to add a Web Part to a page when a round trip to the server clearly occurs. However, these aren t normal form submissions, and you shouldn t process any data that form fields might contain. So, if you re not going to use Page_Load to initialize the display, and you re not going to use it for form submissions, you re probably not going to use it much at all. As in conventional ASP.NET pages, most Web server controls have onServerClick or onServerChange events that can trigger event handlers in a Web Part. This is the normal way of detecting actual form submissions.

good representative set, scripting the top 10 reports will be sufficient in most cases. To find out the most popular reports, you can create a query that retrieves this information from the Execution Logs and Reports table, as shown below:

The Session property of the Page object returns an instance of the System.Web.SessionState.HttpSessionState class. You use this object for storing values that are logically related to a specific user (as opposed to values shared by all users of the application), in much the same way you used the Session object under ASP:

For more information about using onServerClick and onServerChange events in a Web Part, refer to the section titled Using the ASP.NET Event Model later in this chapter.

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Not all pages fit cleanly into a hierarchical structure. The same page can t appear more than once in the same Navigation view diagram. The designer wants more control over the spacing and arrangement of Link Bar

If you reference a session variable that doesn t exist, no exception is thrown and NothZ ing is returned. You must often account for this detail by writing code like this:

pages. If, for example, your SharePoint site had a hundred products to sell, you wouldn t design and diagram a hundred Web pages. Instead, you would create a custom Products list and give the Web visitors Search pages. To understand this last point further, consider the SharePoint approach to providing a list of administrative offices and parts depots in three divisions. Most likely, this would involve:

SELECT TOP 10 COUNT(Reports.Name) AS ReportCount, Reports.Name AS ReportName FROM ExecutionLogs INNER JOIN Reports ON ExecutionLogs.ReportKey=Reports.ReportKey WHERE Reports.ReportType = 2 GROUP BY Reports.Name, Reports.ReportType ORDER BY COUNT(Reports.Name) DESC

A Division list with one item for each valid division. A Location Types list with one item for each valid location type. A Contacts list modified to carry:

Dim objCounter As Object = Session( counter )

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You can also create a new session variable by using the Add method:

A location name rather than a person s name. A lookup field for Division A lookup field for Location Type.

For the sake of simplicity and for the purposes of our hypothetical capacity-planning study, we will limit the number of scripted reports to three, as follows: Employee Sales Summary Territory Sales Drillthrough Purchase Orders In addition, we will assume that the types of the requests for these reports are divided equally between URL and SOAP access.

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This statement overwrites the previous value of counter, if there is one. Session.Add( counter", 0)

Armed with these components and a little advance knowledge from 12, you could construct a Web Part page like the one in Figure 9-4.

The Remove and RemoveAt methods remove a single session variable. You can also delete all the session variables by using either the RemoveAll or the Clear method. The Count property returns the number of session variables. As with ASP, you can read the session identifier by means of the SessionID read-only property, and set or return the session timeout (in minutes) via the Timeout property. The IsNewSession property returns True if the session was created with the current request. The CodePage and LCID writeable properties let you decide the code page identifier and the locale identifier for the current session. The Keys property returns the collection of the names of all session variables:

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