qr code generator c# code project Lesson 2: Working with Data-Bound Web Server Controls in Visual C#

Creation QR Code in Visual C# Lesson 2: Working with Data-Bound Web Server Controls

Lesson 2: Working with Data-Bound Web Server Controls
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ChAPTER 12
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Notice also that the ListView control uses the ASP.NET DataPager control. This control allows you to provide custom data pagers for your data lists. Here the control is embedded at the end of the LayoutTemplate. The ListView control automatically uses the DataPager to move the user through data. Finally, notice the use of the ItemSeparatorTemplate. This is used to put a horizontal rule between data rows. Figure 12-17 shows the results in a browser window.
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FigURE 12-17 The ListView control rendered in the browser.
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The Chart Control
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The Chart control allows you to display data by using chart visualization. You bind a data source to this control much like you do for the other data-bound controls. The big difference is that you then indicate fields from the data source that should be bound to an axis or data series in a chart. There are more than 25 different chart types for displaying data. When the chart control runs on the server, it generate a graphic file (which is a PNG file by default, but you can change this setting) and then sends this to the browser as part of the response.
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Working with Data Source Controls and Data-Bound Controls
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There are hundreds of properties you can set to define your chart and how it displays data. The chart definition typically includes the Series and ChartAreas elements. A Series represents a group of data to be shown on a chart. A Series element has a ChartType that defines the visualization of the data (choices are Bar, Area, Bubble, Line, Column, Pie, Radar, Range, and many more). A ChartArea element is used to indicate specifics about areas on your chart, such as an x and y axis. Here you can set intervals, formatting, and related visual items. As an example, suppose you have the following SqlDataSource control that exposes sales by region.
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<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>" SelectCommand="SELECT SUM([Order Details].UnitPrice * [Order Details].Quantity) AS Total, Orders.ShipCountry FROM Orders INNER JOIN [Order Details] ON Orders.OrderID = [Order Details].OrderID GROUP BY Orders.ShipCountry Order By Total"></asp:SqlDataSource>
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You could then bind this to a Chart control to display each country and the total sales for that country. The following markup shows an example.
<asp:Chart ID="Chart1" runat="server" DataSourceID="SqlDataSource1" Width="702px" Height="581px"> <Series> <asp:Series Name="Series1" XValueMember="ShipCountry" YValueMembers="Total" ChartType=" "Bar" XValueType="String" IsValueShownAsLabel="True" LabelBackColor="White" LabelFormat="{c}"> <SmartLabelStyle CalloutBackColor="White" /> </asp:Series> </Series> <ChartAreas> <asp:ChartArea Name="ChartArea1"> <AxisY> <LabelStyle Format="{c}" /> </AxisY> <AxisX Interval="1"> </AxisX> </asp:ChartArea> </ChartAreas> </asp:Chart>
Running this page will produce results similar to those shown in Figure 12-18.
Lesson 2: Working with Data-Bound Web Server Controls
ChAPTER 12
FigURE 12-18 The Chart control rendered in the browser.
The DataList Control
The DataList control works like the Repeater control. It repeats data for each row in your data set, and it displays this data according to your defined template. However, it lays out the data defined in the template within various HTML structures. This includes options for horizontal or vertical layout, and it also allows you to set how the data should be repeated, as flow or table layout. The DataList control does not automatically use a data source control to edit data. Instead, it provides command events in which you can write your own code for these scenarios. To enable these events, you add a Button control to one of the templates and set the button s CommandName property to the edit, delete, update, or cancel keyword. The appropriate event is then raised by the DataList control. The following markup shows an example of a DataList control configured to show product data from the Northwind database. This control s RepeatDirection is set to show data vertically by using a RepeatLayout of flow. The product data is bound to the DataList control inside the ItemTemplate code.
740 ChAPTER 12
Working with Data Source Controls and Data-Bound Controls
<asp:DataList runat="server" DataSourceID="SqlDataSource1" RepeatDirection="Vertical" ID="DataList1" RepeatLayout="flow"> <ItemTemplate> <asp:Label ID="Label1" runat="server" Text='<%# Eval("ProductName") %>' Font-Bold="True"> </asp:Label> <asp:Label ID="Label2" runat="server" Text='<%# Eval("UnitPrice", "{0:C}") %>'> </asp:Label> <br /> </ItemTemplate> </asp:DataList>
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