Sorting
Enabling sorting is done by setting EnableSorting property to true. You should add appropriate an SortDescriptor to the SortDescriptors collection as well.
Enable Column Sorting
this.radCardView1.EnableSorting = true;
Me.RadCardView1.EnableSorting = True
The following code demonstrates how to add SortDescriptor to RadCardView:
Adding SortDescriptors
SortDescriptor sortDescriptor = new SortDescriptor("Id", ListSortDirection.Ascending);
this.radCardView1.SortDescriptors.Add(sortDescriptor);
Dim sortDescriptor As New SortDescriptor("Id", ListSortDirection.Ascending)
Me.RadCardView1.SortDescriptors.Add(sortDescriptor)