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// Create an expiration that never expires NeverExpired never = new NeverExpired(); // Create a text file to use in a FileDependency File.AppendAllText("ATextFile.txt", "Some contents for the file"); // Create an expiration dependency on the new text file FileDependency fileDep = new FileDependency("ATextFile.txt");
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A clustered index is structured as a balanced tree, and it maintains all the table's data in its leaf level. The clustered index is not a copy of the data; rather, it is the data. I'll describe the structure of a clustered index in SQL Server through the illustration shown in Figure 3-18 .
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In this chapter: Life Without Customer Relationship Management . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Introducing Microsoft Dynamics CRM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 What's New in Microsoft Dynamics CRM 2011 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 User Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Entities and Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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To complete some of the following exercises, you must connect to an exter nal Web site while logged on as Administrator. In a production environment, however, you should avoid exposing your computer to the Internet as much as possible while logged on as Administrator. As an alternative, you can perform administrative tasks by using the Runas command while you are logged on as a user who does not have administrative privileges.
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You can see in Figure 6-7 that all three techniques have a fairly linear performance graph, while Figure 6-8 shows a beautifully curved n2 graph.
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As with the ObjectDataSource control, you can also filter data inside a SqlDataSource control. Again, the data must be a DataSet because the filter is applied to the ADO.NET DataColumn or DataView.RowFilter property. To define a filter, you set the FilterExpression attribute to a valid filter. This filter will be applied after the data is retrieved from the database. You can also use FilterParameters to map values from the page to the filter expression by defining a filter expression that contains parameter mappings as numbers enclosed in braces. You then add the appropriate filter parameters. The following code shows an example of a SqlDataSource control that first selects all products from the database. It then applies a FilterExpression to show only those products that have been discontinued.
Performance and Reliability
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SELECT * INTO dbo.MyOrderValues FROM Sales.OrderValues; ALTER TABLE dbo.MyOrderValues ADD CONSTRAINT PK_MyOrderValues PRIMARY KEY(orderid); CREATE INDEX idx_val ON dbo.MyOrderValues(val);
Ensure that the domain account you want to use is specified in the Policy Setting and attempt to restart the service. If the account you want to use is on a stand-alone machine running Windows Server 2003, run Gpedit.msc. Then expand Local Computer Policy, Computer Configuration, Windows Settings, Security Settings, Local Policies, and finally, select User Rights Assignment. Locate the Log On As A Service right and ensure that the account you want to use is listed. Windows Server 2003 has many options about what it can do if a service fails to start because of any of the reasons described previously. If a service fails, events are logged to the server where the service is loaded. However, you can choose to take a more proactive approach to service management. If you select the Recovery tab of the service, a myriad of options allow you to specify behavior if a service fails, as shown in Figure 12-30.
figure 4 Adding a logging handler
The department administration section allows the client to add, remove, or change department information. To implement this functionality, you ll need to write the necessary code for the presentation, business, and data layers. One fundamental truth regarding n-Tiered applications (which also applies to this particular case) is that the business and data tiers are ultimately created to support the presentation tier. Drawing on paper and establishing exactly how you want the site to look (in other words, what functionality needs to be supported by the UI) is a good indication of what the database and business tier will contain. With the proper design work, you can know exactly what to place in each tier, so the order of writing the code doesn t matter. When the design is clearly established, a team of programmers can work at the same time and implement the three tiers concurrently, which is one of the benefits of having a tiered architecture. However, this rarely happens in practice, except for the largest projects that really need very careful design and planning. In our case, usually the best way is to start with the lower levels (the database and data object) to have the basics established before creating the UI. For this to happen, first you need to analyze what functionality you ll need for the UI; otherwise, you won t know what to write in the data and business tiers. In this chapter, we will always start with the presentation tier. You can do this because now you have a good overview of the architecture and know beforehand how you ll implement the other two tiers. This knowledge is necessary because in the presentation tier, you call methods from the business tier (which you haven t created yet), and in the business tier, you call the data tier (which, again, you haven t yet created). If you don t have a clear idea of how to implement the other tiers, starting with the presentation tier can be trickier in the long run.
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