Creating a unique alphanumeric 10-character string

Question

I\'m looking to create a simple short-lived reservation system, and I\'d like to generate confirmation numbers that are

• unique
• random-looking

Answer 1

In C# you can use http://www.dotnetfunda.com/forums/thread1357-how-do-generate-unique-alpha-numeric-random-number-in-aspnet.aspx (the super easy way, they say)