Add file upload functionality and additional support logic to ASP .net C# website

ASP .net 4.0 website in C# needs image upload functionality implemented, & some supporting logic. Website utilizes MS SQL Server 2008 R2, ## Deliverables The website admin has support for images via URL for both products and categories. Please implement file upload functionality. This shall include at a minimum: 1.) automatic storage of files in /Images or other suitable folder within the website. 2.) validation/logic permitting only files with .jpg or .png extensions to be uploaded. 3.) handling of duplicate filename by automatically renaming by numeric increment. i.e if [login to view URL] already exists in the storage folder then the uploaded image should be renamed [login to view URL] Additonally, logic should be implemented so when a category or product is deleted through the website, associated images are automatically deleted from teh server. Use of any language or script besides C#, and javascript must be approved before implementation. Changes to SQL database are acceptable as long as they are documented.