Telrik grid extension for export

I want to take the export of my telerik grid data.

My question is about this page

I found a way to export the grid data, but one thing which is not make me clear is that in controller the action

Export(int page, string orderBy, string filter){
    GridModel model = Model().ToGridModel(page, 10, orderBy, string.Empty, filter);
    // remaining part
}

What is GridModel? Is it a built-in method? Is there an开发者_如何转开发y assembly reference is required to use it?

And if it is custom method then what do I have to write in it?

The classes you are looking for are in the Telerik.Web.Mvc assembly.