Solver fundation webservice

BACKGROUND - Currently there is an Excel spreadsheet that includes information of cows, fields, plantations, energy costs and the amount of pounds of milk (there are several sheets) and in one or two it loads a summary of these data in a SOLVER (Excel plugin) and returns a result. - What SOLVER does is define the plantation and pounds of milk so that it is the best business option - Personally, I don't know anything about SOLVER, or how to use it, or what to look for. CURRENT SITUATION - The idea is to completely abandon Excel, for this I am developing a web application with Genexus (generating csharp and MsSQL code), where the data is going to be entered and I am missing how to simulate what SOLVER does and obtain the result. - There are several options to simulate the SOLVER, it could be a web service in a highly available site (for example Google) or develop a web service where I pass the data and edit the result. WHAT I NEED - I need to solve the webservice, in case it is developed it should work on IIS, preferably in cSharp. - Looking at the Excel, search the input and output parameters the webservice has - Have several test data to check the result with Excel and some other online tool Can work in English or Spanish