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procedure TForm1.cmdUpdateClick(Sender: TObject);
var
  read, total: Integer;
  buf: Pointer;
  tmpbuf: PSERVER_INFO_100;
  i: integer;
  NIL_HANDLE : Integer;
begin
  ComboBox1.Items.BeginUpdate;
  ComboBox1.Clear;
  NetServerEnum(nil, 100, buf, -1, read, total, SV_TYPE_SQLSERVER, nil, NIL_HANDLE);
  tmpbuf := PSERVER_INFO_100(buf);
  for i:= 1 to read do
  begin
    ComboBox1.Items.Add(WideCharToString(tmpbuf^.sv100_name));
    inc(tmpbuf);
  end;
  ComboBox1.Items.EndUpdate;
  if ComboBox1.Items.Count > 0 then
    ComboBox1.ItemIndex := 0;
  NetApiBufferFree(buf);

end;