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Use partial methods only if you need to call an extra method on one platform but not the other Build platform-specific classes with a single responsibility Create a solution folder for Silverlight and another for WPF Check Silverlight and WPF references when refactoring code The next sections describe each of these guidelines in more detail Use Separated Presentation Patterns to Maximize the Amount of Shared Code Sharing view-code across platforms can be difficult Sharing presentation and business logic is easier if you separate this logic from the UI logic Additionally, this makes your code easier to understand and maintain Write Code So That It Compiles on Both Platforms Where possible, write your application code so that it compiles on both platforms to enable reuse.

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You can also calculate row numbers using a nonequijoin. As an example, the following query calculates row numbers for orders from the Orders table, based on increasing OrderID: SELECT O1.OrderID, O1.CustomerID, O1.EmployeeID, COUNT(*) AS rn FROM dbo.Orders AS O1 JOIN dbo.Orders AS O2 ON O2.OrderID <= O1.OrderID GROUP BY O1.OrderID, O1.CustomerID, O1.EmployeeID;

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You can find similarities between this solution and the preSQL Server 2005 set-based solution I showed in the previous chapter using subqueries. The join condition here contains the same logical expression I used in a subquery before. After applying the first two phases in query logical processing (Cartesian product and ON filter), each order from O1 is matched with all orders from O2 that have a smaller or equal OrderID. This means that a row from O1 with a target row number n will be matched with n rows from O2. Each row from O1 will be duplicated in the result of the join n times. If this is confusing, bear with me as I try to demonstrate this logic with an example. Say you have orders with the following IDs (in order): x, y, and z. The result of the join would be the following: x, x y, x y, y z, x z, y z, z

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The join created duplicates out of each row from O1as many as the target row number. The next step is to collapse each group of rows back to one row, returning the count of rows as the row number: x, 1 y, 2 z, 3 Note that you must include in the GROUP BY clause all attributes from O1 that you want to return. Remember that in an aggregate query, an attribute that you want to return in the SELECT list must appear in the GROUP BY clause. This query suffers from the same N2 performance issues I described with the subquery solution. This query also demonstrates an "expand-collapse" technique, where the join achieves the expansion of the number of rows by generating duplicates, and the grouping achieves the collapsing of the rows allowing you to calculate aggregates. I find the subquery technique more appealing because it's so much more intuitive. I find the "expand-collapse" technique to be artificial and nonintuitive. Remember that in both solutions to generating row numbers you used an aggregate functiona count of rows. Very similar logic can be used to calculate other aggregates either with a subquery or with a join (expand-collapse technique). I will elaborate on this technique in 6 in the "Running Aggregations" section. I'll also describe there scenarios in which I'd still consider using the "expandcollapse" technique even though I find it less intuitive than the subquery technique.

When this approach becomes too complicated, you have to make the tradeoff to see if the cost of having two codebases is less than having a less elegant solution For example, in Silverlight you can execute the following LINQ expression on the Items property of an ItemsControl..

Page 109 When choosing a presentation scheme, you can change the appearance and colors for the table of contents and the slides area of your final published presentation. Figure 7.2 shows which parts of your final presentation are affected by the choices you make when selecting options for the presentation scheme.

Notice the commented second OUTPUT clause in the code, which isn't followed by an INTO clause. Uncomment it if you also want to send the output to the caller; you will have two OUTPUT clauses in the INSERT statement.

Sequence mechanisms produce numbers that you usually use as keys. SQL Server provides a sequencing mechanism via the IDENTITY column property. The IDENTITY property has several limitations that might cause you to look for an alternative sequencing mechanism. In this section, I'll describe some of these limitations and alternative mechanisms to generate keyssome that use builtin features, such as global unique identifiers (GUIDs), and some that you can develop yourself.

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