ASP.NET with VB.NET .. how .......... ?

hello

i wanna sk u about ASP.NET & VS.NET
in VS.NET when i create an aspx file , directly it will create 2 me another file with same name .. but has another extention
(aa.aspx.vb)
my questions is :
Where can i put my ASP.NET Codes in the one with .aspx or in the second with .aspx.vb ??

The VB file is used for "Code Behind". It is used to seperate fucntional code from the display/interface code.

Suggest you do a search on Code Behind on MSDN

Cheers
Simon