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$this->mOrderInfo['auth_code'] = $authCode; $this->mOrderInfo['reference'] = $reference; } This code also sets the corresponding elements from the $mOrderInfo array, just in case they are required before OrderProcessor terminates. In this situation, it wouldn t make much sense to get these values from the database when we already know what the result will be.

LinQ to sQL This addition allows you to connect to a SQL database and query data. You can create an object model to represent your database. You can then use LINQ to insert, update, and delete records as well as query this strongly typed object model. LinQ to Dataset This addition allows you to query against an in-memory, ADO.NET DataSet object. You can use the power of LINQ along with the ubiquity of DataSet objects to simplify working with cached data. LinQ to Entities This addition allows you to write queries against data modeled by using the Entity Framework (EF). The EF is a conceptual model of a database that typically involves an object-to-database mapping layer. LINQ to Entities allows you to query against this object layer by using the power of LINQ. LinQ to XmL This addition provides a LINQ-based interface for working with XML data structures. You can use LINQ to XML to create XML, load an XML file, query XML data, manipulate the XML, and transform the XML into another shape.

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This approach introduces an additional loop-control variable and requires more lines of code, but it emphasizes straightforward programming practice rather than clever use of side effects, which is preferable in production code.

Assume that you re given the task of writing a stored procedure that produces a dynamic pivot in the database you are connected to . The stored procedure accepts the following parameters (all Unicode character strings): @query, @on_rows, @on_cols, @agg_func, and @agg_col . Based on the inputs, you re supposed to construct a PIVOT query string and execute it dynamically . Here s the description of the input parameters: @query Query or table/view name given to the PIVOT operator as input Column/expression list that will be used as the grouping columns

Defining an acceptable level of performance is strictly a matter of personal preference . Some tasks, such as rendering 3D graphics or encoding video files, are CPU-intensive and will benefit greatly from the most muscular processor you can afford . For most everyday activities, including web browsing, sending and receiving e-mail, and creating standard business documents, the speed of the CPU is less critical . A fast hard disk with ample free space and at least 1GB of memory will do much more to keep multiple applications running smoothly . If you use large, memory-intensive programs such as Adobe Photoshop, don t settle for less than 2 GB of RAM .

// Here is the result of a default comparison ci = new CultureInfo("ja-JP"); x = Math.Sign(String.Compare(s1, s2, true, ci)); output += String.Format("Simple {0} Compare: {1} {3} {2}", ci.Name, s1, s2, symbol[x + 1]); output += Environment.NewLine; // Here is the result of a comparison that ignores // kana type (a type of Japanese writing) CompareInfo compareInfo = CompareInfo.GetCompareInfo("ja-JP"); x = Math.Sign(compareInfo.Compare(s1, s2, CompareOptions.IgnoreKanaType)); output += String.Format("Advanced {0} Compare: {1} {3} {2}", ci.Name, s1, s2, symbol[x + 1]); MessageBox.Show(output, "Comparing Strings For Sorting"); } }

Sidebars provide helpful hints, timesaving tricks, or alternative procedures related to the task being discussed .

Windows Vista also creates virtual folders to store files that Internet Explorer tries to save in protected locations. Instead of causing an add-on to fail when it tries to write a data file to the Program Files or Windows folders, Windows silently redirects the file write operation to a virtual equivalent. The program is able to continue, believing that it wrote the files to a system location and not realizing that the data files actually wound up in a hidden virtualized folder that mirrors the actual path and is stored under the Temporary Internet Files folder. Likewise, any attempt to write to the registry is redirected to a Low-integrity area of the registry. What happens when Internet Explorer needs to read those virtualized files A broker process intercepts the operation and asks for your consent before continuing. This represents an important concept of Protected Mode: Whenever any action requires a higher privilege level, such as an ActiveX installation or an attempt to save a file, a broker process must be invoked. Typically, this results in Windows displaying a User Account Control dialog box before the process can continue.