VS 2003 is different then VS 200 logicaly

Hi,
Now I use vs 2003 BUT some previos codes not work correct in this version
for example

<asp:dropdownlist id="dropdownlist1" runat="server" Font-Size="X-Small" Font-Names="Tahoma" OnInit="drop1filll" OnSelectedIndexChanged="go2function" AutoPostBack="True"></asp:dropdownlist></TD>
<TD><asp:dropdownlist id="dropdownlist2" runat="server" Font-Size="X-Small" Font-Names="Tahoma" ></asp:dropdownlist></TD>
<TD><asp:dropdownlist id="dropdownlist3" runat="server" Font-Size="X-Small" OnInit="fil3l" OnSelectedIndexChanged="go3function" AutoPostBack="True" Font-Names="Tahoma"></asp:dropdownlist
In previous version it works like
dropdownlist1 while loadin fiil after that selection -->dropdownlist2 fill, after selection --> dropdownlist3 select anything then show the result
BUt now
dropdownlist1 while loading fill after selection -->dropdownlist2 fill and show result according to dropdownlist2 first choice it is not allow to dropdownlist3 and dropdownlist2 selection.

How can I solve this??When you first loaded your Project into VS2003, didn't it prompt you to convert it?
Sorry,
I can not understand your advise,
can you give me detail...
When you create a Project/Solution in VS 2002 and then open that same Project/Solution in VS 2003, it SHOULD prompt you to "convert" it to work properly with VS 2003.

Do you remember that prompt?