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</asp:Label><br /></td></tr>
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Price: </span>
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<asp:Label ID="PriceLabel" Width="105px" runat="server"
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<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" CommandName="Edit" Text="Edit"> </asp:LinkButton>
Lesson 2: Working with Data-Bound Web Server Controls
<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" CommandName="New" Text="New">
</asp:LinkButton>
<asp:LinkButton ID="LinkButton3" runat="server"
CausesValidation="False" CommandName="Delete" Text="Delete"> </asp:LinkButton> </td></tr> </table> </ItemTemplate> <EditItemTemplate> <table> <tr><td align="center"><hr />
<span style="font-weight: bold; color: blue">VIN:</span> 
<asp:Label ID="VinLabel" Width="105px" runat="server"
Text='<%# Eval("Vin") %>'>
</asp:Label>  
<span style="font-weight: bold; color: blue">Make:</span> 
<asp:TextBox ID="EditMakeTextBox" Width="100px" runat="server"
Text='<%# Bind("Make") %>'>
</asp:TextBox>  
<span style="font-weight: bold; color: blue">Model:</span> 
<asp:TextBox ID="EditModelTextBox" Width="100px" runat="server"
Text='<%# Bind("Model") %>'>
</asp:TextBox>  
<span style="font-weight: bold; color: blue">Year:</span> 
<asp:TextBox ID="EditYearTextBox" Width="100px" runat="server"
Text='<%# Bind("Year") %>'>
</asp:TextBox><br />   </td></tr>
<tr><td align="center">
<span style="font-weight: bold; font-size: large; color: blue">
Price: </span>
<span style="font-weight: bold; font-size: large"> 
<asp:TextBox ID="EditPriceTextBox" Width="100px" runat="server"
Text='<%# Bind("Price") %>'>
</asp:TextBox></span></td></tr>
<tr><td align="center"><hr />
<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="True" CommandName="Update" Text="Update">
</asp:LinkButton>
<asp:LinkButton ID="LinkButton2" runat="server"
CausesValidation="False" CommandName="Cancel" Text="Cancel"> </asp:LinkButton></td></tr></table> </EditItemTemplate> <EmptyDataTemplate> <table width="655px">
<tr><td align="center" ><hr />
<span style="font-weight: bold; font-size: x-large; color: blue">
No Cars For Sale - Chack Back Soon! </span>
<tr><td align="center"><hr />
<asp:LinkButton ID="LinkButton2" runat="server"
CausesValidation="False" CommandName="New" Text="New">
</asp:LinkButton></td></tr></table> </EmptyDataTemplate> <InsertItemTemplate> <table>
3
Exploring Specialized Server Controls
<tr><td align="center"><hr /> <span style="font-weight: bold; color: blue">VIN:</span>  <asp:TextBox ID="InsertVinTextBox" Width="100px" runat="server" Text='<%# Bind("Vin") %>'> </asp:TextBox>   <span style="font-weight: bold; color: blue">Make:</span>  <asp:TextBox ID="InsertMakeTextBox" Width="100px" runat="server" Text='<%# Bind("Make") %>'> </asp:TextBox>   <span style="font-weight: bold; color: blue">Model:</span>  <asp:TextBox ID="InsertModelTextBox" Width="100px" runat="server" Text='<%# Bind("Model") %>'> </asp:TextBox>   <span style="font-weight: bold; color: blue">Year:</span>  <asp:TextBox ID="InsertYearTextBox" Width="100px" runat="server" Text='<%# Bind("Year") %>'> </asp:TextBox><br />   </td></tr> <tr><td align="center"> <span style="font-weight: bold; font-size: large; color: blue"> Price: </span> <span style="font-weight: bold; font-size: large">  <asp:TextBox ID="InsertPriceTextBox" Width="100px" runat="server" Text='<%# Bind("Price") %>'></asp:TextBox></span></td></tr> <tr><td align="center"><hr /> <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="True" CommandName="Insert" Text="Insert"> </asp:LinkButton> <asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel"> </asp:LinkButton></td></tr></table>
</InsertItemTemplate>
<HeaderTemplate>
<table><tr><td align="center"> <span style="font-weight: bold; font-size: x-large; color: blue"> Car For Sale</span></td></tr> <tr><td>
</HeaderTemplate>
<FooterTemplate>
</td></tr></table> </FooterTemplate>
</asp:FormView>
     <br />
</form>
In the declarative markup, the ObjectDataSource is configured to use the CarList class, which is a collection of Car objects. The FormView control is configured to allow edit ing, deleting, and inserting Car rows. The Vin property is configured to display as
Lesson 2: Working with Data-Bound Web Server Controls
read-only when editing, and the Price property is configured to display as currency. To show that you have lots of flexibility using templates with this control, the header, footer, item, edit item, insert item, and empty data templates are configured. The code-behind page only contains code to populate the car list when the Button con trol is clicked, as follows:
'VB Partial Class FormView_Control Inherits System.Web.UI.Page Protected Sub Button1_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Button1.Click
CarList.Initialize()
FormView1.DataBind()
End Sub End Class //C# using using using using using using using using using using
System;
System.Data;
System.Configuration;
System.Collections;
System.Web;
System.Web.Security;
System.Web.UI;
System.Web.UI.WebControls;
System.Web.UI.WebControls.WebParts;
System.Web.UI.HtmlControls;
public partial class FormView : System.Web.UI.Page
{ protected void Button1_Click(object sender, EventArgs e) { CarList.Initialize(); FormView1.DataBind(); } }
When this Web page is executed and displayed, the Web page displays the Button con trol and the empty data template unless you have already populated the CarList. Click the Button to populate the CarList collection and display the contents in the FormView, using the item template. Click the New link on the bottom of the control to add a new row and place the row into edit mode, as shown in Figure 3-47.
3
Exploring Specialized Server Controls
Figure 3-47 The FormView control in edit mode after clicking the New link is populated from an ObjectDataSource and CarList object.
The HierarchicalDataBoundControl Control
The HierarchicalDataBoundControl control serves as a base class for controls that ren der data in a hierarchical fashion. The classes that inherit from HierarchicalDataBoundControl are TreeView and Menu, as shown in Figure 3-48.
WebControl Class Control HierarchicalDataBoundControl Abstract Class BaseDataBoundControl Properties DataSourceID BaseDataBoundControl Abstract Class WebControl
TreeView Class HierarchicalDataBoundControl
Menu Class HierarchicalDataBoundControl
Figure 3-48 The HierarchicalDataBoundControl class hierarchy.
Lesson 2: Working with Data-Bound Web Server Controls
The TreeView Control
The TreeView is a data-bound control that is used to display hierarchical data, such as a listing of files and folders, or a table of contents in a tree structure. The nodes of this control can be bound to XML, tabular, or relational data. This control can also provide site navigation when used with the SiteMapDataSource control. The TreeView control class hierarchy is shown in Figure 3-49.
NOTE
.NET 2.0
The TreeView is new in ASP.NET version 2.0.
WebControl Class Control
TreeView Class
HierarchicalDataBoundControl Properties
TreeNode Class
Properties
BaseDataBoundControl Abstract Class WebControl
HierarchicalDataBoundControl Abstract Class BaseDataBoundControl
TreeNodeBinding Sealed Class
Properties
DataMember Depth FormatString ImageToolTip ImageToolTipField ImageUrl ImageUrlField NavigateUrl NavigateUrlField PopulateOnDemand SelectAction ShowCheckBox Target TargetField Text TextField ToolTip ToolTipField Value ValueField
AutoGenerateDataBindings CollapseImageToolTip CollapseImageUrl EnableClientScript ExpandDepth ExpandImageToolTip ExpandImageUrl HoverNodeStyle ImageSet LeafNodeStyle LevelStyles LineImageFolder MaxDataBindDepth NodeIndent NodeStyle NodeWrap NoExpandImageUrl ParentNodeStyle PathSeparator PopulateNodesFromClient RootNodeStyle SelectedNodeStyle SelectedValue ShowCheckBoxes ShowExpandCollapse ShowLines SkipLinkText TagKey Target Visible
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