循环错在何处，运行完后报错，

暗示either eof or bof is true,or the current record has been deleted!!
unit Unit3;interfaceuses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ComCtrls, Db, ADODB;type
  TForm1 = class(TForm)
    TreeView1: TTreeView;
    ADOConnection1: TADOConnection;
    ADODataSet1: TADODataSet;
    ADODataSet1name: TWideStringField;
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  Form1: TForm1;implementation{$R *.DFM}procedure TForm1.FormCreate(Sender: TObject);
var
 temnode,childnode:TTreeNode;
 i,j:integer;
begin
TreeView1.Items.Clear;
temnode:=TreeView1.Items.Add(TreeView1.Selected,PChar('长城公司'));
adodataset1.first;
while not adodataset1.eof do
begin
TreeView1.Items.AddChild(temnode,adodataset1.FieldValues['name']);
adodataset1.next;
end;
end;end.