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RaiseEvent GridClick(Me, New GridClickEventArgs(eventArgument)) End Sub Protected Overrides Sub CreateChildControls() Dim count As Integer = 0 For row As Integer = 0 To Rows For col As Integer = 0 To Cols count += 1 ' Create and configure a button. Dim ctrlB As New Button() ctrlB.Width = Unit.Pixel(60) ctrlB.Text = count.ToString() ' Set the onClick attribute with a reference to ' __doPostBack. When clicked, ctrlB will cause a ' postback to the current control and return ' the assigned text of ctrlB. ctrlB.Attributes("onClick") = _ Page.ClientScript.GetPostBackEventReference(Me, ctrlB.Text) ' Add the button. Controls.Add(ctrlB) Next ' Add a line break. Dim ctrlL As New LiteralControl("<br />") Controls.Add(ctrlL) Next End Sub End Class

Figure 25-18 shows a web page that allows you to test the ButtonGrid. It handles the GridClick event and displays a message indicating which button was clicked. It also allows the user to specify the number of rows and columns that should be added to the grid.

Although inline binding data from a DataSet may be more common, the technique is no less valid against a DataReader. In the next two examples, you ll try both approaches.

You ll store all shopping cart items in a single table, named ShoppingCart. You can create the new table by either following the steps in the next exercise or by simply executing the SQL script from the Source Code area on the Apress web site.

Note One of the nice things about compiling controls in a separate assembly is that it gives you enhanced

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design-time support. Not only can you add these controls to the Toolbox, you can also create event handlers for any of their custom events (such as the ButtonGrid.GridClick event) using the Properties window. Unfortunately, the same feat isn t possible with user controls.

Note Although a SqlDataSource performs essentially the same function as a DataReader or DataSet, you can t use the SqlDataSource for inline binding. The SqlDataSource can be used only in list and table binding.

Here s the web page code:

Remember that you can also create your table and implement the relationship using database diagrams, as shown in 4. Follow the steps in the next exercise if you prefer to create your new table manually.

Public Partial Class ButtonGridHost Inherits System.Web.UI.Page Protected Sub cmdUpdate_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles cmdUpdate.Click ButtonGrid1.Rows = Val(txtRows.Text) ButtonGrid1.Cols = Val(txtCols.Text) End Sub Protected Sub ButtonGrid1_GridClick(ByVal Sender As Object, _ ByVal e As ServerControlsLibrary.GridClickEventArgs) _ Handles ButtonGrid1.GridClick lblInfo.Text = "You clicked: " & e.ButtonName End Sub End Class

In this example, you ll mimic the results from the Try it Out: Iterating through a DataReader section in the previous chapter and print the details of a single Manufacturer in your sample database. Rather than use a single Web control to present the results, you ll use two Label controls and two HyperLink controls to echo the results. 1. In Visual Web Developer, create a new Web site at C:\BAND\06 and delete the auto-generated Default.aspx file. 2. Add a new Web.config file to the Web site and add a new setting to the <connectionStrings /> element: <add name="SqlConnectionString" connectionString="Data Source=localhost\BAND;Initial Catalog=BAND; Persist Security Info=True;User ID=band;Password=letmein" providerName="System.Data.SqlClient" /> 3. Add a new Web Form called Inline_DataReader.aspx to the Web site. 4. In the Source view, find the <title> tag within the HTML at the bottom of the page and change the page title to Inline Binding to a DataReader. 5. In the Design view, add two Label controls to the page. Name the first lblName and the second lblCountry. Now add two HyperLink controls onto the page. Name them lnkEmail and lnkWebsite. Finally, add one more Label called lblError to house any error messages should something untoward happen (oh, the horror!). Now clear the Text properties for all five Web controls. With a bit of added text (Country, Email, and Website), your page should look something Figure 6-1.

One of the features of the .NET Framework is GDI+, a set of classes designed for creating bitmaps. You can use GDI+ in a Windows or an ASP.NET application to draw dynamic graphics. In a Windows application, the graphics you draw would be copied to a window for display. In ASP.NET, the graphics can be rendered right into the HTML stream and be sent directly to the client browser. In general, using GDI+ code to draw a graphic is slower than using a static image file. However, it gives you much more freedom. For example, you can tailor the graphic to suit a particular purpose, incorporating information such as the date or current user name. You can also mingle text, shapes, and other bitmaps to create a complete picture.

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