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The SqlDataSource data source control is designed to let you execute queries against a SQL Server database to retrieve and update data through bound controls When you add a SqlDataSource object to your page, you populate its ConnectionString and ProviderName properties to tell it what to connect to You then populate its SelectCommand, InsertCommand, UpdateCommand, and DeleteCommand properties with the SQL statements or stored procedure names that are to be executed when data is retrieved or updated Each command can have a set of child Parameter objects that identify their types along with the parameters in the queries or stored procedures The SelectCommand will automatically be executed when data binding occurs to retrieve the data and make it available to any bound controls as a collection Additionally, the insert, update, and delete queries are exposed by the data source control through a standard interface that all bound controls understand and can use to persist changes that are returned through a postback to the underlying data source without requiring any programmatic code The easiest way to get familiar with the code required to use a SqlDataSource is to let the Visual Studio designer write it for you
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Start by creating a new Web site in Visual Studio (File > New > Web Site)
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When you see the source code for the defaultaspx page, change to Design view by clicking the Design tab at the bottom left of the content window You will then see the design surface for the Web page, which should be blank
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3 Bring up Server Explorer (View > Server Explorer), and create a new data connection for the Northwind database if you don't already have one
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Expand the tree for Northwind down to the Customers table, and drag and drop the Customers table onto the design surface for the Web page
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After you do these steps, Visual Studio will add a GridView control and a SqlDataSource control to your page, populate them with all the information needed to retrieve the data from the Customers table, and present it in the gridwithout you needing to write a single line of code If you look at your code-behind file at this point, you will see that it is still empty All of the code needed to set up the binding is added in the markup code of the ASPX file itself, as shown in Listing A3
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Listing A3 Data-Bound GridView Sample
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Defaultaspxcs" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 11//EN" "http://wwww3org/ TR/xhtml11/DTD/xhtml11dtd"> <html xmlns="http://wwww3org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="CustomerID" DataSourceID="SqlDataSource1" EmptyDataText="There are no data records to display"> <Columns> <asp:BoundField DataField="CustomerID" HeaderText="CustomerID" ReadOnly="True" SortExpression="CustomerID" /> <asp:BoundField DataField="CompanyName" HeaderText="CompanyName" SortExpression="CompanyName" /> <asp:BoundField DataField="ContactName" HeaderText="ContactName" SortExpression="ContactName" /> <asp:BoundField DataField="ContactTitle" HeaderText="ContactTitle" SortExpression="ContactTitle" /> <asp:BoundField DataField="Address" HeaderText="Address" SortExpression="Address" /> <asp:BoundField DataField="City" HeaderText="City" SortExpression="City" /> <asp:BoundField DataField="Region" HeaderText="Region" SortExpression="Region" /> <asp:BoundField DataField="PostalCode" HeaderText="PostalCode" SortExpression="PostalCode" /> <asp:BoundField DataField="Country"
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HeaderText="Country" SortExpression="Country" /> <asp:BoundField DataField="Phone" HeaderText="Phone" SortExpression="Phone" /> <asp:BoundField DataField="Fax" HeaderText="Fax" SortExpression="Fax" /> </Columns> </asp:GridView> <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString= "<%$ ConnectionStrings:NorthwindConnectionString1 %>" DeleteCommand="DELETE FROM [Customers] WHERE [CustomerID] = @original_CustomerID" InsertCommand="INSERT INTO [Customers] ([CustomerID], [CompanyName], [ContactName], [ContactTitle],[Address], [City], [Region], [PostalCode],[Country], [Phone], [Fax]) VALUES (@CustomerID, @CompanyName, @ContactName, @ContactTitle, @Address, @City, @Region, @PostalCode, @Country, @Phone, @Fax)" ProviderName= "<%$ ConnectionStrings:NorthwindConnectionString1ProviderName %>" SelectCommand="SELECT [CustomerID], [CompanyName], [ContactName], [ContactTitle], [Address], [City], [Region], [PostalCode], [Country], [Phone], [Fax] FROM [Customers]" UpdateCommand="UPDATE [Customers] SET [CompanyName] = @CompanyName, [ContactName] = @ContactName, [ContactTitle] = @ContactTitle, [Address] = @Address, [City] = @City, [Region] = @Region, [PostalCode] = @PostalCode, [Country] = @Country, [Phone] = @Phone, [Fax] = @Fax WHERE [CustomerID] = @original_CustomerID"> <InsertParameters> <asp:Parameter Name="CustomerID" Type="String" /> <asp:Parameter Name="CompanyName" Type="String" /> <asp:Parameter Name="ContactName" Type="String" /> <asp:Parameter Name="ContactTitle" Type="String" /> <asp:Parameter Name="Address" Type="String" /> <asp:Parameter Name="City" Type="String" /> <asp:Parameter Name="Region" Type="String" /> <asp:Parameter Name="PostalCode" Type="String" /> <asp:Parameter Name="Country" Type="String" /> <asp:Parameter Name="Phone" Type="String" /> <asp:Parameter Name="Fax" Type="String" /> </InsertParameters> <UpdateParameters> <asp:Parameter Name="CompanyName" Type="String" /> <asp:Parameter Name="ContactName" Type="String" /> <asp:Parameter Name="ContactTitle" Type="String" /> <asp:Parameter Name="Address" Type="String" /> <asp:Parameter Name="City" Type="String" /> <asp:Parameter Name="Region" Type="String" /> <asp:Parameter Name="PostalCode" Type="String" /> <asp:Parameter Name="Country" Type="String" /> <asp:Parameter Name="Phone" Type="String" /> <asp:Parameter Name="Fax" Type="String" /> <asp:Parameter Name="original_CustomerID" Type="String" />
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</UpdateParameters> <DeleteParameters> <asp:Parameter Name="original_CustomerID" Type="String" /> </DeleteParameters> </asp:SqlDataSource> </div> </form> </body> </html>
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Obviously, having Visual Studio write all this code for you is preferable and less error-prone than trying to write it all yourself You can also accomplish the same thing by programming against the objects themselves For example, if you don't need to support updating, you don't have to provide insert, update, and delete commands and their parameters You can also use the default behavior of the GridView to autogenerate the columns based on the data it is bound to So the code generated by Visual Studio in Listing A3 can be trimmed down to the code in Listings A4 and A5
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