StringBuilder vs. String / Fast String Operations with .NET 2.0

He is working for a multi national company which is a hard and software vendor of medical equipment. Currently he is located in Germany and enjoys living in general. During his search for programming best practices he was awarded by Microsoft with the Patterns and Pratices Champion Award. Although he finds pretty much everything interesting he pays special attention to .NET software development, software architecture and nuclear physics. To complete the picture he likes hiking in the mountains and collecting crystals.