Filling listboxes (.NET) from file data

Hello to all!

I want to fill a listbox from a .dat file but I am stuck!!!

method-id ShowListBox public.
       local-storage section.
       01 listItem         string.
      
       procedure division.
       open input pinakes.
       read pinakes invalid key invoke type MessageBox::Show("ERROR!!!").
       invoke listBox1::BeginUpdate.
       set listItem to kwd2.
       invoke listBox1::Items::Add(listItem).
       invoke listBox1::EndUpdate.
       close pinakes.
       end method.

What Am I doing wrong...?

PS. I am totally noob in Cobol programming!!!!