can i convert asp.net website to sharepoint portal

hi,

    Please help me to integrate my local asp.net website with sharepoint server..

The Environment i Have used
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operating system:windows server 2003

                    Visual studio 2005
 
                   Windows services 3.0
                  
                   Visual studio 2005 extensios for sharepoint templates..

                  
The Problem

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 I have developed one webapplication that is Income and expenses and database is sqlserver 2005

Ide is vs 2005 with asp.net 2.0



i want to integrate this webapplication  with sharepoint server as a sharepoint site defination or template..


i have installed sharepoint designer in my local system But sharepoint server is production system means remote sustem..


What i have developed
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i have developed webparts by using visual studio class library  But in the webpart i have created dydnamically buttons and
events..its working fine..


By using designer also i integrated .aspx file by using default masterpage and custom masterpage.by adding assemblies in

sharepoint port bin folder..and adding safecontrol in web.config file


But designer is not supporting to add .cs files and events also..





                so please help me any procedure is there to integrate asp.net website with sharepoint server means already developed


website using like sharepoint port...