Can't ignore case while sorting items in LINQ

Question

I am trying to make a sorting on specific table column, initially I tried to do it dynamically using

baseQuery = baseQuery.OrderBy(x => EF.Property<Table>(x.Field, model.TableColumn).Equals("N/A") ? null : EF.Property<Table>(x.Field, model.TableColumn))

and while it does sort the values in ascending order in this case, it does not sort them while ignoring case. I tried adding StringComparer

baseQuery = baseQuery.OrderBy(x => EF.Property<Table>(x.Field, model.TableColumn).Equals("N/A") ? null : EF.Property<Table>(x.Field, model.TableColumn), StringComparer.OrdinalIgnoreCase);

but it is giving me an error:

The type arguments for method 'Enumerable.OrderBy<TSource,TKey>(IEnumerable,Func<TSource,TKey>,IComparer)'cannot be inferred from the usage. Try specifying the type arguments explicitly.

I tried using a more straightforward sorting

baseQuery = baseQuery.OrderBy(x => x.Field!=null && x.Field.Field1!="N/A"?x.Field.Field1:null, StringComparer.OrdinalIgnoreCase);

But it is telling me the LINQ expression could not be translated.

I even tried using

baseQuery = baseQuery.OrderBy(x => x.Field!=null && x.Field.Field1!="N/A"?x.Field.Field1.ToUpper():null);

but it isn't working.

How can I ignore case while sorting table data in LINQ?