Update README.md

Author: SweathaBharathi

README.md

@@ -1,2 +1,13 @@
-# How-to-programmatically-expand-the-root-nodes-in-winforms-treeviewadv-
-This session explains how to programmatically expand the root nodes in winforms treeviewadv?
+# How to programmatically expand the root nodes in WinForms TreeViewAdv?
+
+You can expand the [Root](https://help.syncfusion.com/cr/windowsforms/Syncfusion.Windows.Forms.Tools.TreeViewAdv.html#Syncfusion_Windows_Forms_Tools_TreeViewAdv_Root) nodes of the [WinForms TreeViewAdv](https://www.syncfusion.com/winforms-ui-controls/treeview) by using the [Expand](https://help.syncfusion.com/cr/windowsforms/Syncfusion.Windows.Forms.Tools.TreeNodeAdv.html#Syncfusion_Windows_Forms_Tools_TreeNodeAdv_Expand) method of the node.
+
+```csharp
+TreeNodeAdv root = this.treeViewAdv1.Root;
+
+foreach (TreeNodeAdv node in root.Nodes)
+{
+    node.Expand();
+}
+root.Expand();
+```