Post
Ask Question
Vivek Kumar Vishwas

Vivek Kumar Vishwas

  • NA
  • 115
  • 56.3k

How to create N Level Of TreeView from database in asp.net

Nov 18 2017 6:21 AM
Hello Guys !!
 
I have already asked the same question but now  i am again asking with new requirment, so please read carefully and solve my issues.
 
 My Requirment:
  •    How to create n level of Treeview in asp.net c# from SQL Database Record.
Explaining my Requirment: -  i have a table and there is Srno,PId, Pname, CID, CName,Cqty colums in my table.
 
 
Suppose if CID is also in PID column,  Node must be created on that CID and also must be expand button to show the child of that cID.
 
What i have done in coding let's see...
 
 
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="N-level-Treeview.aspx.cs"
Inherits="N_level_Treeview" %>
<!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>
<asp:TreeView ID="TreeView1" runat="server" ImageSet="XPFileExplorer" NodeIndent="15">
<HoverNodeStyle Font-Underline="True" ForeColor="#6666AA" />
<NodeStyle Font-Names="Tahoma" Font-Size="8pt" ForeColor="Black" HorizontalPadding="2px"
NodeSpacing="0px" VerticalPadding="2px"></NodeStyle>
<ParentNodeStyle Font-Bold="False" />
<SelectedNodeStyle BackColor="#B5B5B5" Font-Underline="False" HorizontalPadding="0px"
VerticalPadding="0px" />
</asp:TreeView>
</div>
</form>
</body>
</html>
 
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;
using System.Data.SqlClient;
using System.Configuration;
public partial class N_level_Treeview : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
DataTable dt = this.GetData("SELECT cId, cName FROM TopBill");
this.PopulateTreeView(dt, 0, null);
}
}
private void PopulateTreeView(DataTable dtParent, int parentId, TreeNode treeNode)
{
foreach (DataRow row in dtParent.Rows)
{
TreeNode child = new TreeNode
{
Text = row["cName"].ToString(),
Value = row["cId"].ToString()
};
if (parentId == 0)
{
TreeView1.Nodes.Add(child);
DataTable dtChild = this.GetData("SELECT srNo,cid, cName FROM TopBill WHERE pid = " + child.Value);
PopulateTreeView(dtChild, int.Parse(child.Value), child);
}
else
{
treeNode.ChildNodes.Add(child);
}
}
}
private DataTable GetData(string query)
{
DataTable dt = new DataTable();
string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
using (SqlConnection con = new SqlConnection(constr))
{
using (SqlCommand cmd = new SqlCommand(query))
{
using (SqlDataAdapter sda = new SqlDataAdapter())
{
cmd.CommandType = CommandType.Text;
cmd.Connection = con;
sda.SelectCommand = cmd;
sda.Fill(dt);
}
}
return dt;
}
}
}
 
-------------- Current Output  of my Code is ....
 
 
 Required Result format is like---------
 
 
In above picture , I am trying to show that if India has some child node, India Must me expandable so that i can see delhi,  If again Delhi Has some child Like Preet vihar , Laxmi Nagar, Delhi also must be expandable to see their child  and so on....
 
 
 
Please solve this issues..
 
 
 
 
 

Attachment: n-level-tree-view.rar

Answers (6)