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uses
  Registry;

procedure TForm1.GetDataSourceNames(System: Boolean);
var
  reg: TRegistry;
begin
  ListBox1.Items.Clear;

  reg := TRegistry.Create;
  try
    if System then
      reg.RootKey := HKEY_LOCAL_MACHINE
    else
      reg.RootKey := HKEY_CURRENT_USER;

    if reg.OpenKey('\Software\ODBC\ODBC.INI\ODBC Data Sources', False) then
    begin
      reg.GetValueNames(ListBox1.Items);
    end;

  finally
    reg.CloseKey;
    FreeAndNil(reg);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  //System DSNs
  GetDataSourceNames(True);

  //User DSNs
  GetDataSourceNames(False);
end;

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