Hello,

Would you upload a sample?

Stanimir Todorov

Dear Raghavendra Dinavahi,

Thanks for using Ignite UI controls.

You may use IEnumberable for enumeration and the model may implement IQueryable for LoadOnDemand instead List.

Please feel free to contact me if you have any additional questions regarding this matter.

Best Regards,

Stanimir Todorov

I see something unusual, I started developing developing fresh application again using the example, when I changes the property

public IEnumerable<SessionDocument> Products { get; set; } to

public IEnumerable<SessionDocument> SessionsDocs{ get; set; } I get the above error "at Infragistics.Web.Mvc.GridModel.RenderHierarchicalQueryableRecursive(IQueryable queryable, WrappedGridResponse response, GridModel baseLayout)" 

Also in your example in

public class Category
   {
       public int ID { get; set; }
       public string CategoryName { get; set; }
       public string Description { get; set; }
       public string ImageUrl { get; set; }
       public int ProductCount { get; set; }
       public IEnumerable<Product> Products { get; set; } 

}

1) Also public IEnumerable<Product> Products { get; set; } IS THIS MANDATORY If The child grid datasource is Product collection? If so should it be IEnumerable?

2) Also I see for model.DataSource will need to be IQueryable for LoadonDemand feature which will return a JsonResult. Can I not have a List? When I try to 

give a List<some object> it give me an error to use implement IQueryable