Figure 4-2: Sample output of the Calendar control in Visual Studio .NET

Printing Code128 in Visual Studio .NET Figure 4-2: Sample output of the Calendar control
Figure 4-2: Sample output of the Calendar control
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The TreeView control is used to present hierarchical data to users in the Windows Explorer style format, wherein the items can be expanded and collapsed. This control, like the other ASP.NET Server controls, is rendered as an HTML 3.2-compatible tree in older browser versions, such as Microsoft Internet Explorer 3.0. In newer browser versions, such as Microsoft Internet Explorer 5.5 and higher, this control is rendered by using the Dynamic HTML (DHTML) behaviors. Hence, compared to the older browser versions, the user experience is richer in the more recent browser versions.
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Unlike the standard ASP.NET controls, TreeView and the other controls discussed in the sections to follow are not shipped as part of the ASP.NET Framework. These are additional controls that must be installed separately. Therefore, when you want to use these controls in an ASP.NET page, you must explicitly import the assemblies containing these controls. To import the assemblies, use the following code: <%@import namespace="Microsoft.Web.UI.WebControls"%> <%@Register TagPrefix="tp" Namespace = "Microsoft. Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls"%> The import directive causes ASP.NET to import the contents of the specified namespace. The Register directive causes ASP.NET to identify all the controls in the specified assembly with the tag prefix "tp." To add a TreeView control to the page, use the following syntax: <tagprefix:TreeView runat="Server"> <tagprefix:treenode text=".." DefaultStyle=" " HoverStyle=" " SelectedStyle=" "> <tagprefix:treenodetype Type=" " ChildType=" "> <tagprefix:treenode text=" "/> <tagprefix:treenode text=" "> </tagprefix:treenode> </tagprefix:treenodetype> The elements used in the preceding code are explained as follows: TreeView: Defines a TreeView control. It acts as a container for the nodes of the tree. The TreeView control is made up of various elements, every one of which is referred to as a node. Some nodes contain other nodes called child nodes. The container nodes are called parent nodes. TreeNode: Represents the node in the TreeView control. TreeNodeType: Defines the type of a node. A single TreeView control can have different types of nodes, such as a folder or any custom type. Properties of the TreeView control In addition to the properties that are inherited from the System.Web.UI.Control base class, the TreeView control has properties that can be used to control the behavior of the control. Some of these properties are described in Table 4-3. Table 4-3: Properties of the TreeView control Property AutoPostBack Description Takes a Boolean value and indicates whether or not the control posts back to the server on each client request. Takes a Boolean value and indicates whether or not a tree node can be selected by simply pointing the mouse to the node, without having to click the
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Table 4-3: Properties of the TreeView control Property DefaultStyle Description node. Sets a default style for the elements in the tree. Sets an image to be displayed when a node is expanded. Sets a style, such as "fontfamily:Verdana;fo ntsize:12pt;color:bla ck," for the elements in the tree when the mouse hovers over them. Sets an image to be displayed to represent a node. Sets the number of pixels by which the child nodes need to be indented. Takes a Boolean value and indicates whether or not lines are used to connect the nodes in the tree.
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Events of the TreeView control The events supported by the TreeView control include Collapse, Expand, and SelectedIndexChanged. The sections that follow look at each of these events in detail.
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Collapse event
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The Collapse event is generated when a user clicks a tree node to collapse it. You can trap this event to control the format and decide the contents of a particular node and its child nodes. The event handler for this event is OnCollapse and has the following syntax: OnCollapse(sender As Object, e As TreeViewClickEventArgs) As you can see, the event handler takes two arguments. The first argument, As Object, represents the object that generated the event. The second argument is the object of the TreeViewClickEventArgs class. This object contains the node information pertaining to this event. A Node object refers to the index of the node that was clicked, and has the following properties:
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Expandable: Sets or retrieves a value that indicates whether or not a plus-sign image is displayed with the node. A plus-sign image indicates that the node is expandable. Expanded: Indicates whether or not the node is expanded. Level: Returns the level of the node; level 0 refers to the root. Text: Returns the text of the selected node.
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