三层数据库,客户端问题!!急!

                            
procedure   TForm1.ComboBox1Change(Sender:   TObject);   
   
  begin  
        dcomconnection1.AppServer.sql('select   name   from   users');  
        ClientDataSet1.close;  
        ClientDataSet1.open;  
   
    while   not   ClientDataSet1.eof=   true   do  
      begin  
   
      combobox1.AddItem(ClientDataSet1.Fields[0].AsString);//它说这里出错!!  
      ClientDataSet1.next;  
      end;  
    end;  
  错在那?请高人指点!!!

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