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Make Quick Response Code in C# Part II

Part II
Creating QR Code ISO/IEC18004 In C#.NET
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Read QR Code 2d Barcode In C#
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ASP.NET Pages and Server Controls
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FIGURE 11-9 Using cascading style sheets to style the markup of a ListView control.
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Working with the ListView Control
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The ListView control makes it easy to handle common data-based operations, such as insert, update, delete, or sorting. All that you have to do is place buttons in the layout template and associate buttons with command names. Buttons can be global to the list (such as insert, sort, and page buttons) or specific to a particular item (such as update and delete buttons). Command names are just strings that are assigned to the CommandName property of the Button control. So far, we have considered only scenarios with relatively static and noninteractive templates. It is definitely possible, though, to use the ListView control to create rich user interfaces that allow in-place editing, selection of items, paging, and updates back to the data source. Let s start with in-place editing.
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In-Place Editing
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Unlike the GridView control, the ListView control doesn t automatically generate an Edit button; nor does it automatically adapt the edit mode user interface from the item template.
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11 The ListView Control
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This responsibility falls to the developer by design. The developer is required to define an edit template that will be used to edit the contents of the selected item, in keeping with the flexible nature of the control.
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Defining the Edit Item Template
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The edit template is any piece of markup you intend to display to your users when they click to edit a record. It can have any layout you like and can handle data access in a variety of ways. If you ve bound the ListView control to a data source control for example, an ObjectDataSource control you can take advantage of the ASP.NET built-in support for two-way data binding. Simply put, you use data binding <%# %> expressions to bind to data, the Eval method for read-only operations, and the Bind method for full I/O operations. The following markup defines a classic two-column table for editing some fields of a customer record:
<table> <tr> <td><b>ID</b></td> <td><asp:Label runat="server" ID="lblID" Text='<%# Eval("ID") %>' /></td> </tr> <tr> <td><b>Name</b></td> <td><asp:TextBox runat="server" ID="txtName" Text='<%# Bind("CompanyName") %>' /></td> </tr> <tr> <td><b>Country</b></td> <td><asp:TextBox runat="server" ID="txtCountry" Text='<%# Bind("Country") %>' /></td> </tr> <tr> <td><b>Street</b></td> <td><asp:TextBox runat="server" ID="txtStreet" Text='<%# Bind("Street") %>' /></td> </tr> <tr> <td><b>City</b></td> <td><asp:TextBox runat="server" ID="txtCity" Text='<%# Bind("City") %>' /></td> </tr> </table>
Only one displayed item at a time can be in edit mode; the EditIndex property is used to get or set this 0-based index. If an item is being edited and the user clicks on a button to edit another one, the last-win policy applies. As a result, editing on the previous item is canceled and it s enabled on the last-clicked item.
Part II
ASP.NET Pages and Server Controls
To turn the ListView user interface into edit mode, you need an ad hoc button control with a command name of Edit:
<asp:Button ID="Button1" runat="server" Text="Edit" CommandName="Edit" />
When this button is clicked, the ItemEditing event fires on the server. By handling this event, you can run your own checks to ensure that the operation is legitimate. If something comes up to invalidate the call, you set the Cancel property of the event data structure to cancel the operation, like so:
protected void ListView1_ItemEditing(object sender, ListViewEditEventArgs e) { // Just deny the edit operation e.Cancel = true; }
Adding Predefined Command Buttons
An edit item template wouldn t be very helpful without at least a couple of predefined buttons to save and cancel changes. You can define buttons using a variety of controls, including Button, LinkButton, ImageButton, and any kind of custom control that implements the IButtonControl interface. Command names are plain strings that can be assigned to the CommandName property of button controls. The ListView (and other view controls) recognizes a number of predefined command names, as listed in Table 11-5.
TABLE 11-5 Supported
Command Names
Command
Cancel Delete Edit Insert Page Select Sort Update
Description
Cancels the current operation (edit, insert), and returns to the default view (item template) Deletes the current record from the data source Turns the ListView control into edit mode (edit item template) Inserts a new record into the data source Moves to the next or previous page Selects the clicked item, and switches to the selected item template Sorts the bound data source Saves the current status of the record back to the data source
The following code shows how to add a pair of Save/Cancel buttons:
<asp:Button ID="btnSave" runat="server" Text="Save" CommandName="Update" /> <asp:Button ID="btnCancel" runat="server" Text="Cancel" CommandName="Cancel" />
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