Display Records Using TreeView in ASP.Net C#

Rahul Saxena
10y
13.8k
0
1

Article

This article shows how to show our records in a tree view using ASP.NET C#.

The following is my Data table design.

design view
Image 1

The following are the records in my Data Table:

table record
Image 2

Here I have Employees and their SupervisorEmployee relationship.

The following 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>Tree View Example in ASP.NET C#</title>
</head>
<body>
<form id="form1" runat="server">
<table cellpadding="4" cellspacing="4" width="50%" align="center" style="background-color: SkyBlue;">
<tr>
<td align="center" style="font-family: Times New Roman; font-size: 14pt; color: Green;">
<h3>
Team Leader and their Team Employee Information</h3>
</td>
</tr>
<tr>
<td style="background: #F5F5F5; padding-left: 30px;">
<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>
</td>
</tr>
</table>
</form>
</body>
</html>

Now, my aspx.cs code:

using System;
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;
using System.Configuration;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
DataTable dt = this.GetData("SELECT EmployeeCode, EmployeeName FROM Employee Where EmployeeSupervisorCode=0");
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["EmployeeName"].ToString(),
Value = row["EmployeeCode"].ToString()
};
if (parentId == 0)
{
TreeView1.Nodes.Add(child);
DataTable dtChild = this.GetData("SELECT EmployeeCode, (EmployeeName+ ', '+ Experience + ', '+ Address) As EmployeeName FROM Employee WHERE EmployeeSupervisorCode = " + 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 = @"Server=MyPC\SqlServer2k8;database=Test;Integrated Security=true;";
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;
}
}
}

Now, run the application:

tree view example

Image 3

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