How do I generate a Friendly URL in C#?

Question

How can I go about generating a Friendly URL in C#? Currently I simple replace spaces with an underscore, but how would I go about generating URL\'s like Stack Overflow?

Answer 1

This gets part of the way there (using a whitelist of valid characters):

new Regex("[^a-zA-Z-_]").Replace(s, "-")

It does, however, give you a string that ends with "--". So perhaps a second regex to trim those from the beginning/end of the string, and maybe replace any internal "--" to "-".