How to customize tree nodes using data template selector in wpf treeview?

Author: saravanan.ayyanar

TemplateSelector/App.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <startup useLegacyV2RuntimeActivationPolicy="true"> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
+         
+    </startup>
+</configuration>

TemplateSelector/App.ico

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+<Application x:Class="NodeWithImageDemo.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:NodeWithImageDemo"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

TemplateSelector/App.xaml

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace NodeWithImageDemo
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

TemplateSelector/App.xaml.cs

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+using Syncfusion.UI.Xaml.TreeView.Engine;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace NodeWithImageDemo
+{
+    class ItemTemplateSelector : DataTemplateSelector
+    {
+        public override DataTemplate SelectTemplate(object item, DependencyObject container)
+        {
+            var treeviewNode = item as TreeViewNode;
+            if (treeviewNode == null)
+                return null;
+            if (treeviewNode.Level == 0)
+                return Application.Current.MainWindow.FindResource("headerTemplate") as DataTemplate;
+            else
+                return Application.Current.MainWindow.FindResource("descriptionTemplate") as DataTemplate;
+        }
+    }
+}