TreeView implementation in ASP.NET with SQL Server 2005

Question

TreeView implementation in ASP.NET with SQL Server 2005 Step-1 Go to ToolBox ->click on treeView and drag it on your .aspx page

Step-2 Open Sql Server 2005 and create two tables tsRoute- CREATE TABLE [dbo].[tsRoute] ( [rid] [int] IDENTITY(1,1) NOT NULL, [routeID] [varchar](50), [startPoint] [varchar](50) ) tsRouteDetails CREATE TABLE [dbo].[tsRouteDetails]( [routedetailsid] [int] IDENTITY(1,1) NOT NULL, [routeid] [varchar](50), [picupsPoint] [varchar](100) Step-3 Open aspx.cs using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data.SqlClient; using DAL4Portal; public partial class Transport_TreeViewdemo : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { fillRouteTree(); } } private void fillRouteTree() { SqlConnection con = null; con = new SqlConnection(); con = DAL.GetConnection(); con.Open(); int parentRouteID = 0; string strQuery = "select * from tsRoute where routeid='ROUTE001'"; SqlCommand cmd = new SqlCommand(strQuery, con); SqlDataReader dr = cmd.ExecuteReader(); string[,] parentRouteNode = new string[1, 2]; int count = 0; while (dr.Read()) { parentRouteNode[count, 0] = dr["routeid"].ToString(); parentRouteNode[count++, 1] = dr["startPoint"].ToString(); } cmd.Dispose(); dr.Close(); //create node with parent node for (int loop = 0; loop < count; loop++) { TreeNode root = new TreeNode(); root.Text = parentRouteNode[loop, 1]; root.Target = "_blank"; // root.NavigateUrl = "TreeViewdemo.aspx"; string strChildQuery = "select * from tsRouteDetails where routeid= '"+ parentRouteNode[loop, 0]+"'"; cmd = new SqlCommand(strChildQuery, con); SqlDataReader childDr = cmd.ExecuteReader(); while (childDr.Read()) { TreeNode childRouteNode = new TreeNode(); childRouteNode.Text = childDr["picupsPoint"].ToString(); childRouteNode.Target = "_blank"; root.ChildNodes.Add(childRouteNode); //root.NavigateUrl = "TreeViewdemo.aspx"; } TreeView1.Nodes.Add(root); } TreeView1.CollapseAll(); TreeView1.CollapseImageUrl = ""; } } Step-4 Output Congratulations!!