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

Drawer QR Code 2d barcode in Visual C#.NET 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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Suppose that this page also contains a button with an event that captures the selected item from the DropDownList and displays it on a label. This button control s event code might look as follows.
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Sample of Visual Basic Code Label1.Text = "You selected TerritoryID: " & DropDownList1.SelectedValue Sample of C# Code Label1.Text = "You selected TerritoryID: " + DropDownList1.SelectedValue;
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When the page is run and the user makes a selection in the DropDownList control and then clicks the button, the results are displayed in the label.
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The ListBox Control
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The ListBox control is used to select and display items from a longer list rather than one at a time as done in the DropDownList. With the ListBox control, users can see more data at once. You can also configure the control to allow the selection of a single item or multiple items. To do so, you set the SelectionMode property. The ListBox control also has the Rows property, which is used to specify the number of items displayed on the screen. The following shows an example of a ListBox that is set to allow multiple selections and show up to 13 rows.
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<asp:ListBox runat="server" Height="225px" Width="275px" ID="ListBox1" Rows="13" DataSourceID="SqlDataSource1" DataTextField="TerritoryDescription" DataValueField="TerritoryID" SelectionMode="Multiple"> </asp:ListBox>
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The Items collection contains the collection of ListItem objects in the ListBox control. To determine which items the user has selected, you can enumerate the ListItem objects in the Items collection by examining the Selected value for each ListItem element. The following code shows an example of processing the selected items and displaying them inside a Label control.
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Sample of Visual Basic Code For Each i As ListItem In ListBox1.Items If i.Selected Then Label1.Text = Label1.Text & "You selected TerritoryID: " & i.Value & "<br />" End If Next Sample of C# Code foreach (ListItem i in ListBox1.Items) { if(i.Selected) Label1.Text = Label1.Text + "You selected TerritoryID: " + i.Value + "<br />"; }
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726 ChAPTER 12
Working with Data Source Controls and Data-Bound Controls
The CheckBoxList and RadioButtonList Controls
The CheckBoxList and RadioButtonList controls are very similar. Both are used to display lists of items to users to allow them to make selections but use a check box or button to make the selection. The RadioButtonList control is used to make a single selection. The CheckBoxList control allows users to make multiple selections. These controls contain a RepeatColumns property that is used to indicate the number of columns to be displayed horizontally. In addition, the RepeatDirection can be set to Horizontal or Vertical (the default) to indicate whether the data should be rendered across by rows or down by columns. The following shows a CheckBoxList control configured to work with the Territory data and show data across five columns.
<asp:CheckBoxList runat="server" ID="CheckBoxList1" DataSourceID="SqlDataSource1" DataTextField="TerritoryDescription" DataValueField="TerritoryID" RepeatColumns="5"> </asp:CheckBoxList>
The Items collection contains the ListItem objects that are inside the CheckBoxList and the RadioButtonList controls. Use the SelectedValue property to determine the item that has been selected for the RadioButtonList. To find the selected CheckBoxList item or items, you can enumerate the ListItem objects in the Items collection by examining the value of the Selected property for each ListItem element.
The BulletedList Control
The BulletedList control displays an unordered or ordered list of items that renders as HTML <ul> or <ol> elements, respectively. The BulletedList control inherits from the ListControl control. This control renders as either bulleted or numbered, depending on the BulletStyle property. If the control is set to render as bulleted, you can select the bullet style to Disc, Circle, or Square. Note that the BulletStyle settings are not compatible with all browsers. A custom image can also be displayed instead of the bullet. If the BulletedList control is set to render numbered, you can set the BulletStyle to LowerAlpha, UpperAlpha, LowerRoman, and UpperRoman fields. You can also set the FirstBulletNumber property to specify the starting number for the sequence. The DisplayMode property can be set to Text, LinkButton, or HyperLink. If set to LinkButton or HyperLink, the control performs a postback when a user clicks an item to raise the Click event. The following example shows a data-bound BulletedList control. The control is bound to a data source control that selects the Shippers table data from the Northwind database.
<asp:BulletedList runat="server" ID="BulletedList1" DataSourceID="SqlDataSource1" DataTextField="CompanyName" DataValueField="ShipperID" BulletStyle="Circle"> </asp:BulletedList>
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