Merge pull request #1 from Santhosh-SF4792/main

Update the README.md file

Author: Lakshminatarajan

README.md

@@ -1 +1,79 @@
-**[View document in Syncfusion Xamarin Knowledge base](https://www.syncfusion.com/kb/12128/how-to-add-or-remove-nodes-to-unbound-mode-treeview-in-xamarin-forms-sftreeview)**
+# add-or-remove-nodes-unbound-mode-treeview-xamarin
+
+This repository demonstrates how to add or remove nodes in unbound mode using the Xamarin.Forms SfTreeView control. It provides a sample implementation that shows how to programmatically manage the tree structure at runtime, enabling dynamic addition and removal of nodes without relying on data binding.
+
+## Sample
+
+### XAML
+```xaml
+<ContentPage.Behaviors>
+        <behavior:Behavior/>
+    </ContentPage.Behaviors>
+    <ContentPage.Content>
+        <StackLayout>
+            <Grid HeightRequest="50" >
+                <Button x:Name="addButton" Text="Add Node" />
+                <Button x:Name="deleteButton" Text="Delete Node" Grid.Column="1"/>
+            </Grid>
+            <syncfusion:SfTreeView x:Name="treeView" NotificationSubscriptionMode="CollectionChange">
+                <syncfusion:SfTreeView.Nodes>
+                    <treeviewengine:TreeViewNode x:Name="australia" Content="Australia" >
+                        <treeviewengine:TreeViewNode.ChildNodes>
+                            <treeviewengine:TreeViewNode Content="New South Wales">
+                                <treeviewengine:TreeViewNode.ChildNodes>
+                                    <treeviewengine:TreeViewNode Content="Sydney"/>
+                                    <treeviewengine:TreeViewNode Content="Canberra"/>
+                                    <treeviewengine:TreeViewNode Content="Newcastle–Maitland"/>
+                                </treeviewengine:TreeViewNode.ChildNodes>
+                            </treeviewengine:TreeViewNode>
+                            <treeviewengine:TreeViewNode Content="Victoria">
+                                <treeviewengine:TreeViewNode.ChildNodes>
+                                    <treeviewengine:TreeViewNode Content="Melbourne"/>
+                                </treeviewengine:TreeViewNode.ChildNodes>
+                            </treeviewengine:TreeViewNode>
+                        </treeviewengine:TreeViewNode.ChildNodes>
+                    </treeviewengine:TreeViewNode>                    
+                </syncfusion:SfTreeView.Nodes>
+            </syncfusion:SfTreeView>
+        </StackLayout>
+    </ContentPage.Content>
+</ContentPage>
+```
+
+### Behavior
+```csharp
+public class Behavior : Behavior<ContentPage>
+{
+    #region Call back
+
+    private void AddButton_Clicked(object sender, EventArgs e)
+    {
+        var india = new TreeViewNode() { Content = "India" };
+        var delhi = new TreeViewNode() { Content = "Delhi" };
+        var newDelhi = new TreeViewNode() { Content = "New Delhi" };
+        delhi.ChildNodes.Add(newDelhi);
+        var tamilNadu = new TreeViewNode() { Content = "Tamil Nadu" };
+        var chennai = new TreeViewNode() { Content = "Chennai" };
+        india.ChildNodes.Add(delhi);
+        india.ChildNodes.Add(tamilNadu);
+        tamilNadu.ChildNodes.Add(chennai);
+
+        TreeView.Nodes.Add(india);
+    }
+
+    private void DeleteButton_Clicked(object sender, EventArgs e)
+    {
+        TreeView.Nodes.RemoveAt(1);
+    }
+
+    #endregion
+}
+```
+
+## Requirements to run the demo
+
+To run the demo, refer to [System Requirements for Xamarin](https://help.syncfusion.com/xamarin/system-requirements)
+
+## Troubleshooting
+### Path too long exception
+If you are facing path too long exception when building this example project, close Visual Studio and rename the repository to short and build the project.