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Clearing out this clutter has several benefits: It s less work to deploy your website, because you don t need to specifically exclude these files. There s also less duplication of settings, because most of what Visual Studio needs (such as assembly references) is stored in the web.config configuration file. Team collaboration is greatly simplified, because different people can work independently on different pages without needing to lock the project files. It s easier to author websites with other tools, because no extra project files need to be maintained. Files can easily be transferred from one web application to another all you need to do is copy the file. Although this simplifies life dramatically, under the radar there are still the last vestiges of Visual Studio s solution-based system. When you create a web application, Visual Studio actually creates solution files (.sln and .suo) in a user-specific directory, like c:\Documents and Settings\[UserName]\Visual Studio 2005\ Projects\[ProjectName]. This file provides a few Visual Studio specific features that aren t directly related to ASP.NET, such as debugging settings. For example, if you add a breakpoint to the code in a web page (as discussed in the Visual Studio Debugging section later in this chapter), Visual Studio stores the breakpoint in the .suo file so it s still there when you open the project later. Similarly, Visual Studio tracks the currently open files so it can restore your view when you return to the project. This approach to solution management is fragile obviously, if you move the project from one location to another, you lose all this information. However, because this information isn t really all that important (think of it as a few project-specific preferences), losing it isn t a serious problem. The overall benefits of a projectless system are worth the trade-off.

As the previous example demonstrates, you can set up master-details forms declaratively, without needing to write any code. However, there are many cases when you ll need to react to the SelectedIndexChanged event. For example, you might want to redirect the user to a new page (possibly with the selected value in the query string). Or, you might want to adjust other controls on the page. For example, here s the code you need to add a label describing the child table shown in the previous example: Protected Sub gridEmployees_SelectedIndexChanged( ByVal sender As Object, ByVal e As System.EventArgs) Dim index As Integer = gridEmployees.SelectedIndex ' You can retrieve the key field from the SelectedDataKey property. Dim ID As Integer = CInt(gridEmployees.SelectedDataKey.Values("EmployeeID")) ' You can retrieve other data directly from the Cells collection, ' as long as you know the column offset. Dim firstName As String = gridEmployees.SelectedRow.Cells(2).Text Dim lastName As String = gridEmployees.SelectedRow.Cells(3).Text lblRegionCaption.Text = "Regions that " & firstName & " " _ & lastName & " (employee " & ID.ToString() & ") is responsible for:" End Sub Figure 10-7 shows the result.

InProc is similar to how session state was stored in classic ASP It instructs ASPNET to store information in the current application domain This provides the best performance but the least durability If you restart your server, the state information will be lost InProc is the default option, and it makes sense for most small websites In a web farm scenario, though, it won t work at all To allow session state to be shared between servers, you must use the out-of-process or SQL Server state service Another reason you might want to avoid InProc mode is because it makes for more fragile sessions In ASPNET, application domains are recycled in response to a variety of actions, including configuration changes, updated pages, and when certain thresholds are met (regardless of whether an error has occurred).

If you really must have projects in Visual Studio 2005, you can; however, you ll need to install a separate add-in. You ll learn how to do that later in this chapter, in the section Visual Studio 2005 Web Application Projects.

You don t need to create a new column to support row selection. Instead, you can turn an existing column into a link. This technique is commonly used to allow users to select rows in a table by the unique ID value. To use this technique, remove the CommandField column and add a ButtonField column instead. Then, set the DataTextField to the name of the field you want to use. <asp:ButtonField ButtonType="Link" DataTextField="EmployeeID" /> This field will be underlined and turned into a link that, when clicked, will post back the page and trigger the GridView.RowCommand event. You could handle this event, determine which row has been clicked, and programmatically set the SelectedIndex property. However, you can use an easier method. Instead, just configure the link to raise the SelectedIndexChanged event by specifying a CommandName with the text Select, as shown here: <asp:ButtonField CommandName="Select" ButtonType="Link" DataTextField="EmployeeID" /> Now clicking the data field automatically selects the record.