c# - Sorting DataTable string column, but with null/empty at the bottom -

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i need sort datatable or datagridview column string value, null/empty values @ bottom when sorting ascending.

the datatable not populated sql statement, no order by.

if do

datagridview1.sort(new rowcomparer(system.componentmodel.listsortdirection.ascending))

then throws exception, saying datagridview databound, correct, doesn't me, , want keep databound.

it's .net 2.0, means no linq available!

in cases if have column in table:

select completed, completed null isnull table order isnull desc, completed desc



edit:
in vb.net

        each srsearchresult in srcsearchresultcollection              try                 dr = dt.newrow()                 dr("cn") = srsearchresult.getdirectoryentry().properties("cn").value                 dr("account") = srsearchresult.getdirectoryentry().properties("samaccountname").value                 dr("nachname") = srsearchresult.getdirectoryentry().properties("sn").value                 dr("vorname") = srsearchresult.getdirectoryentry().properties("givenname").value                 dr("mail") = srsearchresult.getdirectoryentry().properties("mail").value                 dr("homedirectory") = srsearchresult.getdirectoryentry().properties("homedirectory").value                 dr("logonscript") = srsearchresult.getdirectoryentry().properties("scriptpath").value                  dr("isnull") = string.isnullorempty(dr("nachname").tostring())                  dt.rows.add(dr)             catch ex exception              end try          next srsearchresult dt.defaultview.sort = "isnull asc, nachname asc"

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