How can I customize sorting for a specific column on Kendo MVC? I've been trying to use a similar code to the one in this page: https://docs.telerik.com/aspnet-mvc/api/Kendo.Mvc.UI.Fluent/GridBoundColumnSortableBuilder but is not working for me. Not sure if is the Kendo Version but Compare() is not recognized in my code, I only want to customize the sorting for column "Project #"

Here you can see an screenshot of my code:

Any suggestions? What am I missing?