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Here s the web page code you ll need: Public Partial Class EventReviewPage Inherits System.Web.UI.Page Protected Sub cmdGet_Click(ByVal sender As Object, _ ByVal e As EventArgs) Handles cmdGet.Click lblResult.Text = "" ' Check if the log exists. If Not EventLog.Exists(txtLog.Text) Then lblResult.Text = "The event log " & txtLog.Text & _ " does not exist." Else Dim log As New EventLog(txtLog.Text) For Each entry As EventLogEntry In log.Entries ' Write the event entries to the page. If chkAll.Checked Or entry.Source = txtSource.Text Then lblResult.Text &= "<b>Entry Type:</b> " lblResult.Text &= entry.EntryType.ToString() lblResult.Text &= "<br /><b>Message:</b> " & entry.Message lblResult.Text &= "<br /><b>Time Generated:</b> " lblResult.Text &= entry.TimeGenerated lblResult.Text &= "<br /><br />" End If Next End If End Sub Protected Sub chkAll_CheckedChanged(ByVal sender As Object, _ ByVal e As EventArgs) Handles chkAll.CheckedChanged ' The chkAll control has AutoPostback = True. If chkAll.Checked Then txtSource.Text = "" txtSource.Enabled = False Else txtSource.Enabled = True End If End Sub End Class

Visual Studio includes solid support for editing templates in the web page designer. To try this, follow these steps: 1. 2. 3. Create a GridView with at least one template column. Select the GridView, and click Edit Templates in the smart tag. This switches the GridView into template edit mode. In the smart tag, use the Display drop-down list to choose the template you want to edit (see Figure 16-13). You can choose either of the two templates that apply to the whole GridView (EmptyDataTemplate or PagerTemplate), or you can choose a specific template for one of the template columns.

Note For details on the file functions used in Listing 4-4, see the PHP manual at http://www.php.net/

When you explicitly declare a bound field, you have the opportunity to set other properties. Table 17-2 lists these properties.

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Figure 16-13. Editing a template in Visual Studio 4. 5. Enter your content in the control. You can enter static content, drag and drop controls, and so on. When you re finished, choose End Template Editing from the smart tag.

In some cases, you might need to handle events that are raised by the controls you add to a template column. For example, imagine you want to add a clickable image link by adding an ImageButton control. This is easy enough to accomplish: <asp:TemplateField HeaderText="Status"> <ItemTemplate> <asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="statuspic.gif" /> </ItemTemplate> </asp:TemplateField> The problem is that if you add a control to a template, the GridView creates multiple copies of that control, one for each data item. When the ImageButton is clicked, you need a way to determine which image was clicked and to which row it belongs.

Identifies the field (by name) that you want to display in this column. Formats the field. This is useful for getting the right representation of numbers and dates. If True, the DataFormat string is used to format the value even when the value appears in a text box in edit mode. The default is False, which means the underlying value will be used (such as 1143.02 instead of $1,143.02). Sets the text in the header and footer region of the grid if this grid has a header (GridView.ShowHeader is True) and footer (GridView.ShowFooter is True). The header is most commonly used for a descriptive label such as the field name; the footer can contain a dynamically calculated value such as a summary. To show an image in the header instead of text, set the HeaderImageUrl property. If True, it prevents the value for this column from being changed in edit mode. No edit control will be provided. Primary key fields are often read-only. If True, it prevents the value for this column from being set in insert mode. If you want a column value to be set programmatically or based on a default value defined in the database, you can use this feature.

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