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Why is it that most web applications don t use files There are several limitations to files: File-naming limitations: When you create a new file, it obviously can t have the same name as an existing file in the same directory. That means you ll probably need to fall back on some system for randomly generating files names. For example, you might create a file name based on a random number combined with the current date and time, or create a file name that incorporates a globally unique identifier (GUID). With both of these approaches, file names would be statistically unique, which means duplicates would be extremely unlikely. However, the file names wouldn t be very meaningful. In databases, this problem is solved more neatly with the auto-increment data type, which automatically fills a specific field with a unique number when you create a record. Multiuser limitations: Relational databases provide features such as locking and transactions to prevent inconsistencies and make sure multiple people can use the same data at the same time. Comparatively, the web server s file system is woefully backward. Although you can allow multiple users to read a file at once, it s almost impossible to let multiple users update the same file at the same time without catastrophe. Scalability problems: File operations suffer from some overhead. In a simple scenario, file access may be faster than connecting to a database and performing a query. But the cumulative effect in a

The formatting you ve learned so far isn t that fine-grained. At its most specific, this formatting applies to a single column of values. But what if you want to change the formatting for a specific row or even just a single cell The solution is to react to the GridView.RowDataBound event. This event is raised for each row, just after it s filled with data. At this point, you can access the current row as a GridViewRow object. The GridViewRow.DataItem property provides the data object for the given row, and the GridViewRow.Cells collection allows you to retrieve the row content. You can use the GridViewRow to change colors and alignment, add or remove child controls, and so on. The following example handles the RowDataBound event and changes the background color to highlight high prices (those more expensive than $50): Protected Sub grid_RowDataBound(ByVal sender As Object, _ ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) _ Handles grid.RowDataBound If e.Row.RowType = DataControlRowType.DataRow Then ' Get the price for this row. Dim price As Decimal price = CType(DataBinder.Eval(e.Row.DataItem, "UnitPrice"), Decimal) If price > 50 Then e.Row.BackColor = System.Drawing.Color.Maroon e.Row.ForeColor = System.Drawing.Color.White e.Row.Font.Bold = True End If End If End Sub

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large web application is very different. When multiple users are working with files at the same time, your web server may slow down dramatically. Security risks: If you allow the user to specify a file or path name, the user could devise a way to trick your application into accessing or overwriting a protected system file. Even without this ability, a malicious or careless user might use an ASP.NET page that creates or uploads files to fill up your web server hard drive and cause it to stop working. All of these problems are preventable, but they require a bit more work than a database-backed solution. Of course, file access does have its uses. Maybe you need to access information that another application has stored in a file. Or maybe you need to store your information in a file so that other applications can access it. For example, you might be creating an intranet application that allows a small set of trusted employees to upload and manage documents. You could store their documents in a binary field in a database table, but that would make it more difficult to browse and open those files without using your web front end. In these situations, you ll be happy to know that ASP.NET can use all the file access features of the .NET Framework. That means your web applications can freely explore the file system, manage files, and create new files with custom content.

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