how to generate qr code in c# windows application Figure 8-12. Rating control being used to rate a person s preference of Thai food in Visual C#.NET

Drawer QR-Code in Visual C#.NET Figure 8-12. Rating control being used to rate a person s preference of Thai food

Figure 8-12. Rating control being used to rate a person s preference of Thai food
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ReorderList Control
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In many web and desktop applications, you may have come across the typical UI construct for reordering lists that is often done by two buttons (one for Up and another for Down) placed adjacent to the list itself. The user then has to select the item in the list and click the appropriate button enough times to get the selected item in the designated position. It would certainly be nice to be able to simply drag the item to the desired position instead. You have already seen how easy it is with the controls provided in the ASP.NET AJAX tools to implement dragging and dropping of various controls on the page without page postbacks. However, trying to implement a data-bound list still requires much work to allow the user to reorganize the order of the items. The ReorderList control can be applied to a bound object source, such as an ObjectDataSource control, and provide AJAXstyle reordering of the bound items. Table 8-13 lists the main properties of this control.
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Table 8-13. ReorderList Control Properties Property Name
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AllowReorder DataKeyField DataMember DataSource
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Description
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Boolean value indicating whether or not to enable reordering of the items in the list. Field containing the primary key for the underlying data source. Designated field name in the specified data source. Data source object used to bind to the ReorderList control.
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CHAPTER 8 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 2)
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Property Name
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DataSourceID DragHandleAlignment DragHandleTemplate
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Description
ID of the data source control used to retrieve the list of items. Layout alignment of the drag handle (Top, Bottom, Left, Right). Markup/template used for the drag handle. (All template-based properties derive from ITemplate and can be assigned programmatically as well.) Markup/template used when the item is edited. Markup/template used when there are no underlying items. Markup/template used to create a new item. Location of the newly created item (Beginning or End of the list). Markup/template used to display an individual item. Boolean value indicating whether or not to initiate a postback each time an item is reordered. Markup/template used to show where the new item is being relocated to. The key field in the data used to sort the list. Boolean value indicating whether or not to display the inserted item.
EditItemTemplate EmptyListTemplate InsertItemTemplate ItemInsertLocation ItemTemplate PostbackOnReorder ReorderTemplate SortOrderField ShowInsertItem
As you can see by the properties, the ReorderList control not only provides the ability to manually drag and drop items to different positions in the list, it can also perform auto sorting if specified in its property, SortOrderField. One classic case for a list of items that can really take advantage of a reordering functionality is a to-do list of tasks including items whose priority can change. The following markup is used to create a to-do list that allows the user to reorganize its members by simply moving the individual items throughout the list.
<ajaxToolkit:ReorderList ID="ReorderList1" runat="server" PostBackOnReorder="false" DataSourceID="ObjectDataSource1" CallbackCssStyle="callbackStyle" DragHandleAlignment="Left" ItemInsertLocation="Beginning" DataKeyField="ItemID" SortOrderField="Priority"> <ItemTemplate> . . . </ItemTemplate> <EditItemTemplate> . . .
CHAPTER 8 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 2)
</EditItemTemplate> <ReorderTemplate> <asp:Panel ID="Panel2" runat="server" CssClass="reorderCue" /> </ReorderTemplate> <DragHandleTemplate> <div class="dragHandle"></div> </DragHandleTemplate> <InsertItemTemplate> . . . </InsertItemTemplate> </ajaxToolkit:ReorderList>
As you can see, much like many other data-bound controls such as the ASP.NET DataList control, the ReorderList control has support for ItemTemplate, EditItemplate, and more, thereby allowing ample flexibility when dealing with lists of data. Figure 8-13 shows the sample page containing this code in the browser.
Figure 8-13. Items of a to-do list can be rearranged using the ReorderList control.
CHAPTER 8 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 2)
ResizableControl Extender
The ResizableConrol extender is a very well implemented and easy to use extender that can be associated with just about any HTML or ASP.NET UI control. The user can then drag the lower-right corner of the control and resize it much like any window. Before looking at how this extender can be used, take a look at its main properties in Table 8-14.
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