I would probably set this up as two arrays, operands (left side) and results (right side). The arrays would contain structures that have two elements. The first element would be the multiplier for the particular item, and a dictionary with the element symbol as the key and the how much as the value. The Dictionary object has a sort method built in, but you'll probably want to write your own to meet the requirements for sorting the particular elements according the the standard rules of chemistry. For example S comes before O for SO4. I hope you find this approach helpful. If you have any questions, feel free to ask.

Scott E. Corbett Software Engineer/Analyst

I'm not sure I understand what you're asking. If you're talking about binding multiple data sources to a single control, I'm not sure it can be done without writing a custom control. For example, a select list can only have one data source. On the other hand, a custom control can have any number of elements that can be bound to their own individual data sources.

Scott E. Corbett Software Engineer/Analyst

Programming is not something that I dream about. I do tend to think about it a lot while on a long run or bike ride. It's never specifics, just architecture concept stuff.

Scott E. Corbett Software Engineer/Analyst