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Figure 8-4. Administering categories This page works similar to the one for editing departments, but there is an additional link that takes you back to the departments page. When selecting a category, the page loads the list of products for that category (see Figure 8-5).

Next, you need to create the procedure that will generate the custom caching string. This procedure must be coded in the global.asax application file (or its code-behind file) and must use the following syntax:

Public Overrides Function GetVaryByCustomString( _ ByVal context As HttpContext, ByVal arg As String) As String ' Check for the requested type of caching. If arg = "Browser" ' Determine the current browser. Dim BrowserName As String BrowserName = Context.Request.Browser.Browser ' Indicate that this string should be used to vary caching. Return BrowserName Else ' For any other type of caching, use the default logic. Return MyBase.GetVaryByCustomString(context, arg) End If End Function

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if (Page.IsPostBack == false) { // If this page isn't posted back // you need to set up the list control // set up SQL query for the Manufacturer table myCommand.CommandText = "SELECT ManufacturerID, ManufacturerName FROM Manufacturer"; // run query SqlDataReader myReader = myCommand.ExecuteReader(); // set up the list lstManufacturers.DataSource = myReader; lstManufacturers.DataBind(); // close the reader myReader.Close(); } 8. To set up the GridView, you need the following code. Again, you re using only the DropDownList, so the calls against the other Web list controls are commented out. else { // If this page is posted back get the selected value and display // players made by manufacturer. You don't need to rebind the value // for the lists either. They are stored in the viewstate. // set up SQL query for the Player table myCommand.CommandText = "SELECT PlayerID, PlayerName, PlayerManufacturerID, PlayerCost, PlayerStorage FROM Player WHERE PlayerManufacturerID = " + lstManufacturers.SelectedItem.Value; // run query SqlDataReader myReader = myCommand.ExecuteReader(); // setup the GridView GridView1.DataSource = myReader; GridView1.DataBind(); // close the reader myReader.Close(); }

Figure 8-5. Administering products Finally, the last page allows you to do additional product details management, such as changing the product s category, removing a product from a category or from the catalog, and so on (see Figure 8-6). The navigation logic between the department, category, and product administration pages is done using query string parameters.

The GetVaryByCustomString() function passes a string with a value of VaryByCustom in the arg parameter. This allows you to create an application that implements several types of custom caching in the same function. Each type would use a different VaryByCustom name (such as Browser, BrowserVersion, or DayOfWeek). Your GetVaryByCustomString() function would see the value VaryByCustom in the arg parameter and then return the appropriate caching string. If the caching strings for different requests match, ASP.NET will reuse the cached copy of the page. Or to look at it another way, ASP.NET will create and store a separate cached version of the page for each caching string it encounters. Interestingly, the base implementation of the GetVaryByCustomString() method already includes the logic for browser-based caching. That means you don t need to code the method shown previously. The base implementation of GetVaryByCustomString() creates the cached string based on the browser name and major version number. If you want to change how this logic works (for example, to vary based on name, major version, and minor version), you could override the GetVaryByCustomString() method, as in the previous example.

The OutputCache directive has a third attribute that you can use to define caching. This attribute, VaryByHeader, allows you to store separate versions of a page based on the value of an HTTP header received with the request. You can specify a single header or a list of headers separated by semicolons. Multilingual sites could use this technique to cache different versions of a page based on the client browser language.

9. And last but not least, you need to tidy things up, like so: } finally { // always close the connection myConnection.Close(); } } 10. Save the page, and then view it in a browser. Select one of the Manufacturers from the drop-down list. The page will post back to the server and, presto, return with the details for the Players made by that Manufacturer, as shown in Figure 6-10.

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