php to asp.net conversion

I have a shopping cart script which was developed by a freelancer in php long time back. The script is very old now and needs to be revamped. The main purpose of this revamp is to convert it from php to asp.net. I want same functionality as the php is doing in asp.net. No new / additional features are required. Only design has to be changed. Please quote me time and cost required to convert this php based project into asp.net based project. Please note that currently project is made in PHP and MySQL and it needs converted to ASP.NET and MSSQL. If you have any questions / comments then please ask. Thanks.