C-10 shows the very brief code-behind file. in .NET

Creator Quick Response Code in .NET C-10 shows the very brief code-behind file.

Example C-10 shows the very brief code-behind file.
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Example C-10. The code-behind file for Exercise 3-1
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Partial Class _Default Inherits System.Web.UI.Page Protected Sub ddlStates_SelectedIndexChanged(ByVal sender As Object, _ ByVal e As System.EventArgs) pceStates.Commit(ddlStates.SelectedValue) End Sub End Class
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3: Snappier Web Sites with AJAX
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Exercise 3-2. This is a fairly simple extender to work with it does what it says it does. To start, create a new AJAX-enabled web site and call it Exercise 3-2. First add the Panel control, call it pnlRounded, and set its Width to 150, its Height to 100, and its BackColor to LightGray (or whatever you prefer). Add the Label control inside the Panel, call it lblRounded, and set its Width to 50, its BackColor to DarkGray, its ForeColor to White, and its Font.Bold to True. So far, nothing particularly interesting has happened. Now, add two
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RoundedCornersExtender controls: rceLabel and rcePanel. The first thing to do is make sure that the TargetControlID for rceLabel is set to lblRounded, and that for rcePanel, it s set to pnlRounded. For the rest, you ll have to check out the online documentation, which will tell you that there s a property called Radius, and one called Corners. Those properties aren t available in Design view, so switch to Source view and set the Radius for rceLabel to 2; for rcePanel, set the Radius to 8, and the Corners to Top, so that the bottom corners of the Panel will be left square. There you go! It s
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not the most exciting extender, but you can see how you might use it to add a little bit of style to your forms. The markup for this page is in Example C-11. There is no code-behind file for this example.
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Example C-11. The markup file for Exercise 3-2
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<%@ Page Language="VB" AutoEventWireup="true" CodeFile="Default.aspx.vb" Inherits="_Default" %> <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>Exercise 3-2</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <div> <asp:Panel ID="pnlRounded" runat="server" Height="100px" Width="150px" BackColor="LightGray">  <br />   <asp:Label ID="lblRounded" runat="server" BackColor="DarkGray" Text="Label" Width="50px" Font-Bold="True" ForeColor="White"></asp:Label> <cc1:RoundedCornersExtender ID="rceLabel" runat="server" TargetControlID="lblRounded" Radius=2 > </cc1:RoundedCornersExtender> </asp:Panel> </div>
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Appendix C: Answers to Quizzes and Exercises
Example C-11. The markup file for Exercise 3-2 (continued)
<cc1:RoundedCornersExtender ID="rcePanel" runat="server" TargetControlID="pnlRounded" Radius=8 Corners=top> </cc1:RoundedCornersExtender> </form> </body> </html>
If you experiment with this extender, you ll find that it doesn t work on other controls, such as the TextBox or the DropDownList. Sometimes the documentation doesn t tell you everything you need to know, and you can only find out by trial and error. Exercise 3-3. This exercise is slightly tricky because of the need for two textboxes. Start by creating an AJAX-enabled page. Type Volume Level: and then add a TextBox control. This is the TextBox that you want to see in the finished page, so name it txtVolume_Bound. Set its Width to 15px, and its ReadOnly property to True (you don t want users typing in there). That s the easy part. Now add another TextBox, called txtVolume, on a new line. None of the display properties matter on this TextBox, because users will never see it. Now add the SliderExtender, and call it sleVolume. Switch to Source view, set the TargetControlID to txtVolume, the BoundControlID to txtVolume_Bound, and the Maximum to 10. Run the application, and the slider should work as you d expect, although you ll only see one TextBox. The markup for this page is shown in Example C-12. There is no code-behind.
Example C-12. The markup for Exercise 3-3
<%@ Page Language="VB" AutoEventWireup="true" CodeFile="Default.aspx.vb" Inherits="_Default" %> <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>Exercise 3-3</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <div>  <div> Volume Level:    <asp:TextBox ID="txtVolume_Bound" runat="server" Width="15px" ReadOnly="True"></asp:TextBox>  <br />
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