how to generate qr code in c# windows application Figure 7-12. Selecting a car using CascadingDropDown controls in C#.NET

Drawer QR Code in C#.NET Figure 7-12. Selecting a car using CascadingDropDown controls

Figure 7-12. Selecting a car using CascadingDropDown controls
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Let s examine the markup for this page:
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<div class="demoheading">CascadingDropDown Demonstration</div> <table> <tr> <td>Make</td> <td><asp:DropDownList ID="DropDownList1" runat="server" Width="170" /> </td> </tr> <tr> <td>Model</td> <td><asp:DropDownList ID="DropDownList2" runat="server" Width="170" /> </td> </tr> <tr>
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CHAPTER 7 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 1)
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<td>Color</td> <td><asp:DropDownList ID="DropDownList3" runat="server" Width="170" AutoPostBack="true" OnSelectedIndexChanged="DropDownList3 SelectedIndexChanged" /> </td> </tr> </table> <br /> <ajaxToolkit:CascadingDropDown ID="CascadingDropDown1" runat="server" TargetControlID="DropDownList1" Category="Make" PromptText="Please select a make" LoadingText="[Loading makes...]" ServicePath="CarsService.asmx" ServiceMethod="GetDropDownContents" /> <ajaxToolkit:CascadingDropDown ID="CascadingDropDown2" runat="server" TargetControlID="DropDownList2" Category="Model" PromptText="Please select a model" LoadingText="[Loading models...]" ServiceMethod="GetDropDownContentsPageMethod" ParentControlID="DropDownList1" /> <ajaxToolkit:CascadingDropDown ID="CascadingDropDown3" runat="server" TargetControlID="DropDownList3" Category="Color" PromptText="Please select a color" LoadingText="[Loading colors...]" ServicePath="CarsService.asmx" ServiceMethod="GetDropDownContents" ParentControlID="DropDownList2" /> ... </div>
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The three ASP.NET drop-down controls at the beginning of this code segment make up the three selection points, which are followed by the three CascadingDropDown controls. Each of these extender controls specifies the corresponding drop-down (by using the TargetControlID property) as well as the ServicePath ServiceMethod properties, which will be used as a data source. And that s it! Beyond that, there is a little more code on the web form itself that displays text to the users in the appropriate event handlers. The rest of the work is done in a web service as listed here:
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[WebMethod] public AjaxControlToolkit.CascadingDropDownNameValue[] GetDropDownContents(string knownCategoryValues, string category)
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CHAPTER 7 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 1)
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{ StringDictionary knownCategoryValuesDictionary = AjaxControlToolkit. CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues); return AjaxControlToolkit.CascadingDropDown. QuerySimpleCascadingDropDownDocument(Document, Hierarchy, knownCategoryValuesDictionary, category); }
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The main part of this web service is the GetDropDownContents web method shown in the preceding code segment. This method first gets a dictionary object of known category/value pairs and queries the data document for results. This data document is nothing more than an XmlDocument object loaded with data from an XML file. In fact, if you look in the App_Data folder in the solution, you ll see an XML file called CarService.xml, which holds the data for the drop-down controls. Figure 7-13 shows the contents of CarService.xml.
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Figure 7-13. CarService.xml
CHAPTER 7 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 1)
CollapsiblePanelExtender Control
The CollapsiblePanelExtender control allows you to easily make visually appealing collapsing and expanding effects on panels used in your web page with minimal code. This extender is quite simple yet very flexible and is particularly useful in scenarios where you have large amounts of text, some of which does not need to be initially presented to the users. Also with many useful properties, its collapse/expansion behavior can be well customized. This includes the ability to have the panel auto expand or auto collapse depending on the mouse hovering. Table 7-7 lists some of the properties of the CollapsiblePanelExtender control.
Table 7-7. Properties of the CollapsiblePanelExtender Control Property Name
AutoCollapse AutoExpand Collapsed CollapseControlID CollapsedImage CollapsedSize CollapsedText ExpandControlID ExpandDirection ExpandedImage ExpandedSize ExpandedText ImageControlID ScrollContents TargetControlID TextLabelID
Description
Boolean value indicating whether or not to collapse the panel when the mouse moves away from it Boolean value indicating whether or not to expand the panel when the mouse hovers over it The initial state of the panel ID of the control responsible for collapsing the panel Path to the image file used by ImageControlID (when collapsed) Collapsed size of the target control in pixels Displayed text when the panel is collapsed ID of the control responsible for expanding the panel Direction of expansion of the panel (horizontal/vertical) Displayed image when the panel is expanded Expanded size of the target control in pixels Displayed text when the panel is expanded ID of the image control serving as status indicator for the state of the panel (collapsed/expanded) Boolean value indicating whether or not to make the panel scrollable ID of the target panel control ID of the Label control containing the status text of the panel
Let s turn our attention again to the SampleWebSite project that ships the full source version of the ASP.NET AJAX Control Toolkit where the CollapsiblePanel is used extensively in nearly all pages. Specifically, in Solution Explorer, expand the CollapsiblePanel folder, and take a look at the CollapsiblePanel,aspx page where the focus is this extender.
CHAPTER 7 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 1)
For the purposes of this demo, let s focus only on the first panel on top of the page as shown in Figure 7-14.
Figure 7-14. Example of CollapsiblePanel (in collapsed mode)
This portion of the page consists of two panels with a CollapsiblePanelExtender, and it displays some basic information about ASP.NET AJAX. There is a little image on the right side of the panel that collapses or expands the panel when clicked. Here s the .aspx markup for this portion of the page:
<asp:Panel ID="Panel2" runat="server" CssClass="collapsePanelHeader" Height="30px"> <div style="padding:5px; cursor: pointer; vertical-align: middle;"> <div style="float: left;">What is ASP.NET AJAX </div> <div style="float: left; margin-left: 20px;"> <asp:Label ID="Label1" runat="server">(Show Details...) </asp:Label> </div> <div style="float: right; vertical-align: middle;"> <asp:ImageButton ID="Image1" runat="server" ImageUrl="~/images/expand_blue.jpg" AlternateText=" (Show Details...) " /> </div> </div> </asp:Panel> <asp:Panel ID="Panel1" runat="server" CssClass="collapsePanel" Height="0"> <br />
CHAPTER 7 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 1)
<p> <asp:ImageButton ID="Image2" runat="server" ImageUrl="~/images/AJAX.gif" AlternateText="ASP.NET AJAX" ImageAlign="right" /> <%= GetContentFillerText() %> </p> </asp:Panel> </div> <ajaxToolkit:CollapsiblePanelExtender ID="cpeDemo" runat="Server" TargetControlID="Panel1" ExpandControlID="Panel2" CollapseControlID="Panel2" Collapsed="True" TextLabelID="Label1" ExpandedText="(Hide Details...)" CollapsedText="(Show Details...)" ImageControlID="Image1" ExpandedImage="~/images/collapse_blue.jpg" CollapsedImage="~/images/expand_blue.jpg" SuppressPostBack="true" />
The first panel (Panel2) is essentially the header where the image to expand/collapse the panel is located. The majority of the actual content is in the second panel. In this case, the content is being generated by a method called GetContentFillerText. So notice that while the TargetContronID property of the CollapsiblePanelExtender is set to Panel1, the ExpandControlID and CollapseControlID properties are both set to Panel2, which is essentially the header panel. The small icon on the right portion of the header changes depending on the state of the panel as specified by the ExpandedImage and CollapsedImage properties. Figure 7-15 shows this panel in expanded mode.
CHAPTER 7 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 1)
Figure 7-15. Example of CollapsiblePanel (in expanded mode)
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