Introduction:
In this article,i am going to explain about how to effectively use asp.net treeview in asp.net 2.0 and above versions.

Main:
The ASP.NET 2.0TreeView control can be used to display hierarchical data from a data source. You can create a TreeView control programmatically in the .aspx file as shown in the following code snippet:

You can easily add nodes to the TreeView control programmatically,

TreeNode root = new TreeNode(); root.Text = "Root Node"; this.TreeView1.Nodes.Add(root); TreeNode child1 = new TreeNode(); child1.Text = "Child 1"; root.ChildNodes.Add(child1); TreeNode child2 = new TreeNode(); child2.Text = "Child 2"; root.ChildNodes.Add(child2); this.TreeView1.ExpandAll();

We can easily bind any kind of data using datasourceid property,see the below simple examble,

<asp:TreeView ID="TreeView1" runat="server" DataSourceID="SqlDataSource1" BackColor="White" Font Bold="True" Font-Italic="True" ForeColor="Black"> <ParentNodeStyle Font-Bold="True" ForeColor="Black" BackColor="SkyBlue" /> <SelectedNodeStyle Font-Underline="True" HorizontalPadding="0px" VerticalPadding="0px" BackColor="#C04000" /> <NodeStyle Font-Names="Verdana" Font-Size="8pt" ForeColor="Black" HorizontalPadding="5px" NodeSpacing="0px"   VerticalPadding="0px" BackColor="#00C0C0" /> <DataBindings> <asp:TreeNodeBinding DataMember="Address" ValueField="Value"/> <asp:TreeNodeBinding DataMember="Employee" ValueField="Name"/> </DataBindings> <LeafNodeStyle BackColor="#FFE0C0" /> </asp:TreeView>

In code behind sample,

private void CreateTreeView() { for (int i = 0; i < 10; i++) { TreeNode treeNode = new TreeNode(); treeNode.Text = "Node Item: " + i.ToString(); treeNode.Value = "Node Item: " + i.ToString(); treeNode.ShowCheckBox = true; treeNode.ToolTip = "This is Node Item: " + i.ToString(); TreeView1.Nodes.Add(treeNode); } this.Panel1.Controls.Add(TreeView1); }

Conclusion:
Hope this helps,
Happy Coding.