class to detect URLs in text and create a link for each one

Users will use a form to enter a paragraph or several paragraphs of text. The background library must detect each URL in the text and wrap them in a HREF tag. Rules: 1. This must be written in C# 4.5 2. No compiled dll, libraries can be used 3. The code must be returned in the form of a class 4. It must detect URLs inside a text box when posted by a form 5. Detect URLs and convert (wrap them inside) HREF html links 6. Do not transform fully typed URL links entered be the user: For example: - https://google.com/#q=producttwo - [login to view URL] If the user entered a full link, then just wrap with HREF, and do not convert them: - <a href=" https://google.com/#q=producttwo ">https://google.com/#q=producttwo</a> - <a href=" [login to view URL] ">[login to view URL]</a>