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TreeView in ASP.NET

Posted By:satyapriyanayak       Posted Date: August 31, 2013    Points: 40    Category: ASP.NET Controls    URL: http://www.dotnetspark.com  

We will know how to create treeview nodes and corresponding sub treeview nodes from the database.
 

Scenario: -

I have two tables in Sql Server Database:
Table1: Category - Columns are Category_ID, CategoryName
Table2: SubCategory -Columns are SubCategory_ID, SubCategoryName, Category_ID


Category Table Data:

1   Item1
2   Item2
3   Item3
4   Item4

SubCategory Table Data

1  SubItem1   1
2  SubItem2   1
3  SubItem3   1
4  SubItem4   2
5  SubItem5   2
6  SubItem6   3
7  Subitem7   3
8  Subitem8   4



 


<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="TreeView_in_ASP.NET._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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:treeview ID="Treeview1" runat="server"></asp:treeview>
    </div>
    </form>
</body>
</html>



using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
namespace TreeView_in_ASP.NET
{
    public partial class _Default : System.Web.UI.Page
    {
        string strConnString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        string str;
        SqlCommand com, com1;

        protected void Page_Load(object sender, EventArgs e)
        {
            bindtreeview();
        }
        void bindtreeview()
        {
            SqlConnection con = new SqlConnection(strConnString);
            con.Open();
            str = "Select * from Category";
            com = new SqlCommand(str, con);
            SqlDataReader reader = com.ExecuteReader();
            com.Dispose();
            string[,] ParentNode = new string[100, 2];
            int count = 0;
            while (reader.Read())
            {
                ParentNode[count, 0] = reader.GetValue(reader.GetOrdinal("Category_ID")).ToString();
                ParentNode[count++, 1] = reader.GetValue(reader.GetOrdinal("CategoryName")).ToString();
            }
            reader.Close();
            for (int loop = 0; loop < count; loop++)
            {
                TreeNode root = new TreeNode();
                root.Text = ParentNode[loop, 1];
                com1 = new SqlCommand("Select * from SubCategory  where Category_ID =" + ParentNode[loop, 0], con);
                SqlDataReader reader1 = com1.ExecuteReader();
                while (reader1.Read())
                {
                    TreeNode child = new TreeNode();
                    child.Text = reader1.GetValue(reader1.GetOrdinal("SubCategoryName")).ToString();
                    root.ChildNodes.Add(child);
                }
                reader1.Close();
                Treeview1.Nodes.Add(root);
            }
            Treeview1.CollapseAll();
            con.Close();
        }
    }
}



     

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