Update README.md

Author: SweathaBharathi

README.md

@@ -1,5 +1,8 @@
 # How to count all checked nodes of WinForms TreeViewAdv?
 
+## About Sample
+This sample provides the demo on how to get the count for all checked nodes [WinForms TreeViewAdv](https://www.syncfusion.com/winforms-ui-controls/treeview).
+
 You can get the count for all checked nodes in [WinForms TreeViewAdv](https://www.syncfusion.com/winforms-ui-controls/treeview) control by using [CheckedNodes](https://help.syncfusion.com/cr/windowsforms/Syncfusion.Windows.Forms.Tools.TreeViewAdv.html#Syncfusion_Windows_Forms_Tools_TreeViewAdv_CheckedNodes) property. Refer the below code for your reference.
 
 **C#**
@@ -11,6 +14,7 @@ int checkedCount = treeView1.CheckedNodes.Count;
 ```csharp
 Dim checkedCount As Integer = treeView1.CheckedNodes.Count
 ```
+
 ![count of checked nodes](output.png)
 
 Take a moment to peruse the [WinForms TreeViewAdv - CheckBox](https://help.syncfusion.com/windowsforms/treeview/getting-started#checkbox) documentation, to learn more about checkbox with examples.