Binding Controls to an ADO.NET Data Source in .NET framework

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Binding Controls to an ADO.NET Data Source
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Like controls on Windows forms, Web form controls support simple-binding virtually any property to a single value in data source and complex-binding control properties that
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display multiple values. However, the binding mechanisms for Web forms are somewhat different from those that we ve seen and used with Windows forms. Note In the Web form document ation, simple- and complex-binding are referred to as single-value and multirecord binding. Simple-Binding Control Properties Web form controls can always be bound at run time. They can also be bound at design time if the data source is available. (Because Web Forms applications tend to use Data commands more often than DataSets, the data source is less often available at design time.) Unlike Windows forms, simple-bound Web form control properties don t expose databinding properties. Instead, the value is explicitly retrieved and assigned to the property at run time by using a data-binding expression. In Microsoft Visual Studio .NET, the Properties window supports a tool for creating databinding expressions, or you can create them at run time. The run time data-binding expression is delimited by <%# and %>: propName = (<%# dataExpression %>) The dataExpression can be any expression that resolves to a single data item a column of a DataRow, a property of another control on the page, or even an expression. Note, however, that Web forms don t support a BindingContext object or anything similar to it, so there is no concept of a current row. You must specifically indicate which row of a data source, such as a DataTable, will be displayed in the bound property. So, for example, to refer to a DataColumn within a DataSet, you would need to use the following syntax: <%# myDataSet.myTable.DefaultView(0).myColumn %> You can use a data-binding expression almost anywhere in a Web form page, as long as the expression evaluates at run time to the correct data type. You can, of course, use type-casting to coerce the value to the correct type. For example: myTextbox.Text = <%# myDataSet.myTable.Rows.Count.ToString() %> Simple-Bind a Control Property at Design Time 1. Open the WebForms project from the Start page or the File menu. 2. In the Solution Explorer, double-click WebForm1.aspx. Visual Studio displays the page in the form designer.
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Select the tbCategoryName text box. In the Properties window, select (DataBindings) and click the Ellipsis button.
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Visual Studio opens the DataBindings dialog box.
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In the Simple Binding pane, expand dsMaster1/Categories/DefaultView/DefaultView.[0], and select CategoryName.
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Click OK.
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Visual Studio creates the binding. You can examine the syntax of the data-binding attribute on the HTML Note tab of the project. Find the tag that defines the tbCategoryName text box. If the data source isn t available at design time, you can bind a control property at run time. Although it s possible to do this in the control tag, it s much easier to do so by using the DataBinding event that is raised when the DataBind method is called for the control. Simple-Bind a Control Property at Run Time
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1. Press F7 to display WebForm1.aspx.vb. 2. Select tbCategoryDescription in the Control Name combo box, and then select DataBinding in the Method Name combo box.
Visual Studio adds the event handler. 3. Add the following code to the procedure: Me.tbCategoryDescription.Text = Me.dsMaster1.Categories(0).Description
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1. Select tbCategoryDescription in the form designer. 2. In the Properties Window, click the Events button, and then doubleclick DataBinding. Visual Studio opens the code window and adds the event handler. 3. Add the following code to the procedure: 4. this.tbCategoryDescription.Text = this.dsMaster1.Categories[0].Description; Just as with Windows forms, before you can display the data on your Web form, you must explicitly load it from the data source by filling a DataAdapter or executing a Data command. But Web forms require an additional step: You must push the data into the control properties. This is done by calling the DataBind method, which is implemented by all controls that inherit from System.Web.UI.Control. A call to the DataBind method cascades to its child controls. Thus, calling DataBind for the Page class will call the DataBind method for all the controls contained by the Page class. When the DataBind method is invoked for a control, either directly or by cascading, the data expressions embedded in control tags will be resolved and the DataBinding events for the controls will be triggered. If you re using a Web form to update data, you must be careful when you call the DataBind method. Much like a DataSet s AcceptChanges method, DataBind replaces the values currently contained in the bound properties. Display Bound Data in the Page
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