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It is interesting to note that if you simply refresh the browser, rather than click a button on the page, the counter will not be incremented.

Translated into an instruction to Excel, this would read as follows: If the value in the rL1.PeriodSel cell plus 1 is greater than the number of #N/A values in the rD1.DataCumulation range, write the string No Data for Period . Otherwise, write an empty text .

The cost of finding defects is only one part of the cost equation. The other is the cost of fixing defects. It might seem at first glance that how the defect is found wouldn t matter it would always cost the same amount to fix. That isn t true because the longer a defect remains in the system, the more expensive it becomes to remove. A detection technique that finds the error earlier therefore results in a lower cost of fixing it. Even more important, some techniques, such as inspections, detect the symptoms and causes of defects in one step; others, such as testing, find symptoms but require additional work to diagnose and fix the root cause. The result is that one-step techniques are substantially cheaper overall than two-step ones. Microsoft s applications division has found that it takes 3 hours to find and fix a defect using code inspection, a one-step technique, and 12 hours to find and fix a defect using testing, a two-step technique (Moore 1992). Collofello and Woodfield reported on a 700,000-line program built by over 400 developers (1989). They found that code reviews were several times as cost-effective as testing 1.38 return on investment vs. 0.17. The bottom line is that an effective software-quality program must include a combination of techniques that apply to all stages of development. Here s a recommended combination: Formal design inspections of the critical parts of a system Modeling or prototyping using a rapid prototyping technique Code reading or inspections Execution testing

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} The net effect of this code is that any changes entered in the source CSV document are cached to a temporary file, which then replaces the original. The user won't perceive anything of these workings, however. The CSV Reader/Writer in Action Let's take a sample CSV file, read it, and apply some changes to the contents so that they will automatically be persisted when the reader is closed. Here is the source CSV file: LastName,FirstName,Title,Country Davolio,Nancy,Sales Representative,USA Fuller,Andrew,Sales Manager,USA Leverling,Janet,Sales Representative,UK Suyama,Michael,Sales Representative,UK The idea is to replacing the expression Sales Representative with another one say, Sales Force. The sample application, nearly identical to the one in 2, loads the CSV file, applies the changes, and then displays it through a desktop DataGrid control, as follows: // Instantiate the reader on a CSV file XmlCsvReadWriter reader; reader = new XmlCsvReadWriter("employees.csv", hasHeader.Checked); reader.EnableOutput = true; reader.Read(); // Define the schema of the table to bind to the grid DataTable dt = new DataTable(); for(int i=0; i<reader.AttributeCount; i++) { reader.MoveToAttribute(i); DataColumn col = new DataColumn(reader.Name, typeof(string)); dt.Columns.Add(col); } reader.MoveToElement(); // Loop through the CSV rows and populate the DataTable do { DataRow row = dt.NewRow(); for(int i=0; i<reader.AttributeCount; i++) { 164

can change the data while the read is in progress. Therefore, it is safe to use an allocation order scan. Of course this comes at the cost of requests for modi cations being blocked during the read. Another example where the storage engine knows that it is safe to employ an allocation order scan is when the index resides in a read-only legroup or database. To summarize, the storage engine will use an allocation order scan of the safe category when the index size is greater than 64 pages and the data is read-only (because of the TABLOCK hint, read-only legroup, or database). Keep in mind that logical fragmentation has an impact on the performance of index order scans but not on that of allocation order scans. And based on the preceding information, you should realize that the storage engine will sometimes use index order scans to process an Index Scan operator with the Ordered: False property. The next section will demonstrate both unsafe and safe allocation order scans. Run the following code to create a table called T1:

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