Points are taken. I agree with Peter too. The whole purpose of this article was giving an introduction of creating UDT with CLR components and I tried my best to explain it. But the sample I had taken is controversial that because I have considered only the requirements I had at that time. I tested this implementation with a sample database and had no performance problems though it has violated some general rules. I may be testing the implementation with VLDBs to check the performance. It may be worthwhile implementing calculated column for maintaining difference between stocks rather than maintaining an UDT. Let me do the load testing and see. Apart from this, hope I have shown the way of creating UDTs understandable.

I appreciate all of your comments on this.