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TECHNOLOGIES:
 

Showing table data in hierarchical structure

Article:
Viewed:  1199 
Posted On:  26/07/2012 13:29:50 
In this article I am going to show how we can have table data in a tree view format. 

In this article I am going to show how we can have a table data in a tree view format. Treeview is a viewer for hierarchical structures. 

This is my table data.

TableImage1.JPG


Image 1.

I put my database in App_data folder inside application.

This is my aspx code

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default"%>

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <div>

        <table cellpadding="2" cellspacing="2" border="2" width="50%" align="center">

            <tr>

                <td>

                   Hierarchical Structure of Table Data

                </td>

            </tr>

            <tr>

                <td>

                    <asp:TreeView ID="TreeView1" ExpandDepth="0" PopulateNodesFromClient="true"ShowLines="true"

                        ShowExpandCollapse="true" runat="server" />

                </td>

            </tr>

        </table>

    </div>

    </form>

</body>

</html>

 

This is my aspx.cs code

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.Data.SqlClient;

 

public partial class _Default : System.Web.UI.Page

{

    SqlConnection con;

    SqlCommand cmd = new SqlCommand();

    SqlDataAdapter da;

    DataSet ds = new DataSet();

    DataTable dt = new DataTable();

 

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!Page.IsPostBack)

        {

            GetData();

        }

    }

 

    public void GetData()

    {

        con = new SqlConnection("Data Source=.; Initial Catalog=MyData; uid=sa; pwd=wintellect;");

        cmd.CommandText = "Select * from CourseDetail";

        cmd.Connection = con;

        da = new SqlDataAdapter(cmd);

        con.Open();

        cmd.ExecuteNonQuery();

        da.Fill(ds);

        if (ds.Tables[0].Rows.Count > 0)

        {

            foreach (DataRow dr in ds.Tables[0].Rows)

            {

                if (dr.ItemArray[1] == DBNull.Value)

                {

                    TreeNode t = BuildNode((string)dr.ItemArray[2]);

                     t.Value = "0";

                    FillNodeChildren(t, int.Parse(dr.ItemArray[0].ToString()));

                    this.TreeView1.Nodes.Add(t);

                }

            }

        }

    }

 

    private TreeNode BuildNode(string Text)

    {

        return new TreeNode(Text);

    }

 

    // The level of tree 

    int intLevel = 0;

    // Recursive function to populate Treeview node 

    public void FillNodeChildren(TreeNode _Parent, int _ParentID)

    {

        intLevel++;

        DataView Data = new DataView(ds.Tables[0]);       

        foreach (DataRow dr in ds.Tables[0].Rows)

        {

            if (dr.ItemArray[1] != DBNull.Value)

            {

                if (object.Equals(dr.ItemArray[1].ToString(), _ParentID.ToString()))

                {

                    TreeNode t = BuildNode((string)dr.ItemArray[2]);

           t.Value = intLevel.ToString();

                    FillNodeChildren(t, int.Parse(dr.ItemArray[0].ToString()));                  

                    _Parent.ChildNodes.Add(t);

                    System.Diagnostics.Trace.WriteLine("Added node at level " + intLevel.ToString());

                }

            }

 

        }

        intLevel--;

    } 

}


Output


When I run the application then the page will be as follows


TableImage2.JPG 

Image 2.

If I expand node then

TableImage3.JPG

Image 3.

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