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// run query SqlDataReader myReader = myCommandExecuteReader(); // set up the GridView GridView1DataSource = myReader; GridView1DataBind(); // close the reader myReaderClose(); The only difference from the previous example is that you ve changed the page to respond to a specific event, SelectedIndexChanged, to bind the Players to the GridView The one new piece of code that you ve added here is the DataBound event, which you use to add the please select.. entry to the list A DropDownList always has an item selected, since it must display something, even if the user hasn t made a selection When you first loaded the page Apple was the selected entry, but the list of Players made by Apple wasn t shown in the list Contrast this with both the RadioButtonList and the ListBox, which don t have a selected item when they re first loaded.

Catalog Admin</a>  « </td> </tr> </ContentTemplate> </asp:RoleGroup> </RoleGroups> </asp:LoginView> </table> 12. Open BalloonShop.master and drag the UserInfo control from Solution Explorer just before the list of departments, as shown in Figure 8-9.

Don t use filtering unless you are using caching. If you use filtering without caching, you are essenTip

tially retrieving the full result set each time and then extracting a portion of its records. This combines the worst of both worlds you have to repeat the query with each postback, and you fetch far more data than you need each time.

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So, you need some way of dealing with this, which is the purpose of the please select.. entry to the Web list control All additions to a Web list control must be made once any data binding has occurred Before ASPNET 20, any additions to a Web list control had to be made after the Web list control had been data-bound, as follows: // data-bind the list DropDownList1DataBind(); // add the "please select.." entry ListItem myListItem = new ListItem(); myListItemText = "please select.."; myListItemValue = "-1"; lstManufacturersItemsAdd(myListItem); While this works without any problems, you re using an event-driven programming model, and the new DataBound event can be used for this purpose: protected void lstManufacturers_DataBound(object sender, EventArgs e) { ListItem myListItem = new ListItem(); myListItemText = "please select.."; myListItemValue = "-1"; lstManufacturersItems.

The ObjectDataSource caching works on the data object returned from the SelectMethod. If you are using a parameterized query, the ObjectDataSource distinguishes between requests with different parameter values and caches them separately. Unfortunately, the ObjectDataSource caching has a significant limitation it works only when the select method returns a DataSet or a DataTable. If you return any other type of object, you ll receive a NotSupportedException. This limitation is unfortunate, because there s no technical reason you can t cache custom objects in the data cache. If you want this feature, you ll need to implement data caching inside your method by manually inserting your objects into the data cache and retrieving them later. In fact, caching inside your method can be more effective, because you have the ability to share the same cached object in multiple methods. For example, you could cache a DataTable with a list of products and categories and use that cached item in both the GetProductCategories() and GetProductsByCategory() methods.

Figure 8-9. Adding the UserInfo control to the Master Page 13. Start your project and ensure that your UserInfo control looks good. The next step is to create the login page. Right-click the root entry in Solution Explorer, select Add New Item, choose the Web Form template, and name it Login.aspx. Make sure the two check boxes are checked and click Add. 14. In the dialog box that opens, select the BalloonShop.master entry and click OK.

The only consideration you should keep in mind is to make sure you use unique cache key names that Tip aren t likely to collide with the names of cached items that the page might use. This isn t a problem when using the built-in data source caching, because it always stores its information in a hidden slot in the cache.

Insert(0, myListItem); } Once the data binding of the Web list control is complete, the DataBound event is fired and the new entry added to the Web list control Either option works to do the same task, but using the event separates the different parts of the code more cleanly and will make the code easier to maintain later Obviously, you can t use the dummy entry please select .. as a Manufacturer Therefore, you check that the selected entry is a real one when handling the SelectedIndexChanged event..

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