Sde-vs with asp.net in vs 2005

I have a prpblem

after I create new website in visual studio 2005 prof.

I recieved this msg , I don’t why?!
while If I create a windown application, it works fine :frowning:

I need any help

thanks
sde.bmp

Dear dark_angle,

Please add App_Code first.

Best regards,
Jick
appcode.PNG