Hi Vaibhav,
We regret for the inconvenience caused.
We are still able to visit link without any errors which was provided earlier. Could you please try the samples link as follows:
http://samples.syncfusion.com/ASPNET/7.3.0.20/Web/Grid.Grouping.Web/Samples/3.5/and then click on Essential Grid tree view menu(which is placed at left side of samples site) as follows
“Populate Data” -> “Master-Detail View Demo” .
Let me know if you have any concerns.
Regards,
Bharath