For the Grid, is is possible to have a a SortField along with Field (that displays the data) in columns.
The SortField will be used instead of Field when sorting (if Grid is Sortable), like in WebForms: https://docs.microsoft.com/en-us/dotnet/api/system.web.ui.webcontrols.gridview.sortexpression?view=netframework-4.8.
Maybe you want to sort data based on other values instead of what is displayed.
This could be especially useful for dates that have been formatted for display in Field
but you don't want to use for sorting because date and string sorting is not the same.