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(We'll examine creating INSERT, UPDATE, and DELETE statements later on in this article.) Figure 2 The last step of the wizard allows you to run the SELECT statement specified against the data store to see what data, exactly, is returned.
That's all there is to configuring a Sql Data Source.
If you find yourself cutting and pasting code you might forget to change a table or column name in the SQL syntax of the pasted code, or you might forget that for the pasted code you need to handle NULL data differently than before. NET 2.0 introduces a new class of server controls—the data source controls.
Choose the Sql Data Source you just added and, like magic, the Grid View will automatically have columns corresponding to the fields returned by the data source control. NET Web page after tying a Grid View to a Sql Data Source that returns the Product ID, Product Name, Quantity Per Unit, Unit Price, and Units In Stock fields of the Products table in the Northwind database. NET control, have a corresponding declarative markup that is inserted into the ASP. The markup below shows the complete markup for the page shown in Figure 4.Later on in this article we'll see how to customize what columns should be shown, how to format the columns, and so forth. NET page, simply drag them from the Visual Studio 2005 Toolbox onto the appropriate ASP. Once you do this, the control's Smart Tag will appear with an option titled "Configure Data Source." Choosing this option will launch a wizard that prompts for the requisite information.For the Sql Data Source, the first screen prompts you to specify the connection string for data store you want to connect to (see Figure 1).But before we do, realize that when displaying data on a Web page, accessing the data is only one part of the puzzle. Next, you'll need to specify what data the Grid View should display.The other piece is displaying the data, and that's where the Grid View control comes in. The Grid View control, like all data Web controls in ASP.NET 2.0, has a Data Source ID property, which you can set to the ID of the data source control whose data you want to display.By setting the Grid View's Data Source ID, the Grid View will, by default, show all the fields of all the records returned by the data source control.Additionally, placing data access logic in the ASP. The data store's schema in your application may be large and particularly unwieldy to developers new to the project. NET page, these developers must have an intimate understanding of the data model and its relation to the program in order to create or modify ASP. A better approach for large Web applications is to divide the application's architecture into different layers.Typically Web applications are divided into three layers: Assuming you have setup a Data Access Layer (DAL), the ASP.Visual Basic Public Class Product #Region "Private Member Variables" Private _product ID As Integer Private _product Name As String Private _quantity Per Unit As String 'Consider making _unit Price & _unit In Stock nullable fields, 'since they are NULL in the Northwind database.Private _unit Price As Decimal Private _units In Stock As Integer #End Region #Region "Constructors" Public Sub New() End Sub Public Sub New(By Val product ID As Integer, _ By Val product Name As String, By Val quantity Per Unit As String, _ By Val unit Price As Decimal, By Val units In Stock As Integer) Me._product ID = product ID Me._product Name = product Name Me._quantity Per Unit = quantity Per Unit Me._unit Price = unit Price Me._units In Stock = units In Stock End Sub #End Region #Region "Public Properties" Public Property Product ID() As Integer Get Return _product ID End Get Set(By Val value As Integer) If value As you can see in the source code, the Get Products() method retrieves the pertinent fields from the Northwind database's Products table in a Sql Data Reader and then loops through the retrieved results, creating a Product instance of each one and adding that instance to a List of Products.