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In a very fundamental way LINQ was designed to improve developer productivity Because LINQ makes query statements more like standard language statements, developers are not sidetracked by incorporating a special flavor of SQL depending on the database system Likewise, built-in tools in ASPNET 35, such as the LinqDataSource control, make development easier through several properties used in LINQ queries The next section examines how to use the controls in ASPNET 35 to make queries as well as nonquery operations with LINQ
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To see how to use the new LINQ control LinqDataSource, this example goes through a rather lengthy Visual Studio 2008 process However, once everything is done, you may be surprised at how little ASPNET code the process generates Basically, the whole operation uses only two controls: LinqDataSource and DetailsView If you are familiar with the DetailsView control from ASPNET 20, you will be happy to hear that the new 35 version of control can use the LinqDataSource control as a data source So while a lot of this will look new, the key display control is an old friend
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This next set of steps to get you started requires Visual Studio 2008 If you are using one of the Express versions of Visual Studio, be sure that any add-ons for LINQ are in place Also, you will need to:
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1 Open a new Web Site, and name it ShowLinq 2 Open Solution Explorer and rename Defaultaspx to ShowLinqaspx
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ASPNET 35: A Beginner s Guide
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3 Rename _Default to DoLinq in the C# script, and have it rename the ASPNET
inherit (inherits DoLinq)
4 Right-click the App_Data folder and select Add New Item 5 Under Templates select SQL Server Database, and in the Name window change
the default name to ServiceRegmdf as shown in Figure 14-1 Click the Add button when finished
6 Open the Server Explorer and you should see ServiceRegmdf among the databases
Right-click the Tables folder icon, and select Add New Table as shown in Figure 14-2
7 When the table window opens, add the information shown in Figure 14-3 RegID is
a primary key field and an identity field, so values enter automatically
8 Save the table using the name RegClients You will see the table listed in the Tables
folder of the ServiceRegmdf database in the Server Explorer
Figure 14-1 Selecting SQL database
14:
LINQ
Figure 14-2 Adding a new table
Figure 14-3 Setting the fields in a new table
( continued )
ASPNET 35: A Beginner s Guide
9 Right-click the RegClients table and select Show Table Data The first time takes
a little while You will see the five fields you created Click in the first field and press TAB to move to the LastName field Begin entering records in this second field because the first field automatically enters values Add about five records to have something to work with Figure 14-4 shows an example (Whenever you make changes in a record, the ReqID changes, so some of the ReqID values are out of sequence in Figure 14-4)
10 In the Solution Explorer right-click the site (C:\ShowLinq\), select Add ASPNET
Folder, and select App_Code You will now see a new App_Code folder in the Solution Explorer
11 Right-click the App_Code folder and select Add New Item Select LINQ To SQL
Classes, and in the Name window change the default name to RegClientsdbml and click Add Figure 14-5 shows the correct settings
Figure 14-4 Sample records
14:
LINQ
Figure 14-5 Adding the LINQ to SQL Classes template
12 After you click Add, a double window opens This is the Object Relational Designer
Drag the RegClients table from the Server Explorer into the right window as shown in Figure 14-6
13 From the Solution Explorer open the ShowLinqaspx file Then from the Toolbox Data
menu drag a LinqDataSource control and drop it inside the <div> container Switch to the Split mode or to Design mode
(continued )
ASPNET 35: A Beginner s Guide
Figure 14-6 Dragging the table into the Object Relational Designer
14 Click the LinqDataSource object and open the Properties window Next to
ContextTypeName, select RegClientsDataContext as shown in Figure 14-7
15 Set the TableName property to RegClients and the AutoPage property
to True
14:
LINQ
Figure 14-7 Setting the ContextTypeName property
16 Set the following LinqDataSource1 properties to True:
EnableDelete EnableInsert EnableUpdate
17 From the Toolbox Data menu, drag a DetailsView control beneath the LinqDataSource
object as shown in Figure 14-8
( continued )
ASPNET 35: A Beginner s Guide
Figure 14-8 Adding the DetailsView control
18 Select the DetailsView control and in the Properties window select the
LinqDataSource1 as the DataSourceID as shown in Figure 14-9
19 Widen the DetailsView control, and then in the Properties window set the following
to True:
AutoPage AutoGenerateDeleteButton AutoGenerateEditButton AutoGenerateInsertButton
20 Once you have the settings complete, press CTRL-F5 to test the application Figure 14-10
shows what you should see
14:
LINQ
Figure 14-9 Setting the DetailsView control DataSourceID property to LinqDataSource1
Figure 14-10
A LINQ-supported application
(continued )
ASPNET 35: A Beginner s Guide
Figure 14-11
Inserting a new record
21 To test the functionality of the application, click New and add a record as shown in
Figure 14-11 Do not type anything into the RegID field because that is automatically filled Once you ve finished, click Insert and your new record is added All of those steps generated very little ASPNET code In looking at the ASPNET portion of the application, all that you will see is shown in the following listing:
ASPNET ShowLinqaspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ShowLinqaspx cs" Inherits="DoLinq" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml"> <head runat="server"> <title>ASPNET Linq</title> </head> <body> <form id="form1" runat="server"> <div> <asp:LinqDataSource ID="LinqDataSource1" runat="server" ContextTypeName="RegClientsDataContext" EnableDelete="True" EnableInsert="True" EnableUpdate="True" TableName="RegClients">
14:
</asp:LinqDataSource> <asp:DetailsView ID="DetailsView1" runat="server" DataSourceID="LinqDataSource1" AllowPaging="True" AutoGenerateDeleteButton="True" AutoGenerateEditButton="True" AutoGenerateInsertButton="True" DataKeyNames="RegID" Height="50px" Width="205px"> </asp:DetailsView> </div> </form> </body> </html>
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