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static class members belong to the class as a whole. Static members can only be accessed through the class name such as in Math.Sin() and are typically used when creating generic functionality that isn t tied to a particular instance. A class can contain both static and instance members, but a class that is declared static can only contain static members. The static class fields can be initialized in the static constructor, which is executed only once in the application lifetime just before the first static field, property, or method of the class is accessed. Under the hood, the static class members are called on a global instance of that class, which is not destroyed by the GC (garbage collector) after execution. Because the static constructor is called only once per application lifetime, and the global instance is never destroyed, we can ensure that any initializations performed by the static constructor (such as reading the database connection string) are performed only once, and the values of any static members are persisted. A static class member can call or access another static class member directly. However, if you needed to access an instance class member (nonstatic class member) from a static class member, you had to create an instance of the class, even from a method of that class, to access that member. For more information about static class members, please read an OOP C# tutorial, such as the one available for download from Cristian Darie s web site, at http://www.cristiandarie.ro/downloads/.

9. Click the Constraint box, and then type the number 0. 10. Click Add. This constraint ensures that you will invest a nonzero amount for these CDs. 11. Click the Cell Reference box, and then select cells B15 and B16 (CD Investments for Three-Month CDs and Six-Month CDs in Month 1). 12. In the operator list, select >=. 13. Click the Constraint box, and then type the number 1. 14. Click Add. This constraint ensures that you will invest a nonzero amount for these CDs. 15. Click the Cell Reference box, and then select cells B18 through H18 (Total End Cash). 16. In the operator list, select >=. 17. Click the Constraint box, and then type 100000. 18. Click Add. This constraint ensures that you will forecast at least $100,000 in ending cash. 19. Click the Cell Reference box, and then select cell E15 (CD Investment for Three-Month CD in Month 4). 20. In the operator list, select >=. 21. Click the Constraint box, and then type the number 1. 22. Click OK. This constraint ensures that you will invest a nonzero amount for this CD. 23. Click Options. 24. Check the Assume Linear Model check box, and then click OK. 25. Click Solve. Compare your results to Figure 4-41.

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Note In Class1.cs, the first three lines begin with the keyword using. The keyword using tells Visual C#

We ve chosen to use static members mainly to improve performance. Because static classes and static members are initialized only once, they don t need to be reinstantiated each time a new visitor makes a new request; instead, their global instances are used. In the presentation tier, you ll display your list of departments with a call like this: list.DataSource = CatalogAccess.GetDepartments(); If GetDepartments is an instance method, you need to create a separate instance of the CatalogAccess class instead of using the static instance, which would have had, obviously, a bigger performance impact: CatalogAccess catalogAccess = new CatalogAccess(); list.DataSource = catalogAccess.GetDepartments(); In BalloonShopConfiguration, you ve implemented an additional trick to improve performance by caching connection string data using static fields (dbConnectionString and dbProviderName), whose data is read in from web.config in the class s static constructor. The static class constructor is called only once per application s life cycle, so the web.config file won t be read on every database operation, but just once when the class is initialized.

Now that everything is in place in the other tiers, all you have to do is create the presentation tier the final goal you ve been working toward from the beginning. As you saw in the figures at the beginning of this chapter, the departments list needs to look something like Figure 4-15 when the site is loaded in the web browser.

Express you want to use the functionality defined in the reference after the using keyword. This is a shortcut, which we didn t use in this example so that you could see another way of using a reference.

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