Sharing data from classes with read-only properties

One of the purposes of object-oriented design patterns is to hide complex …operations inside classes. And then, only expose the results, …without showing how the work is being done. …One of the tools that Visual Basic provides for this purpose is a read only property. …A property that can be set from within the class, but then only read from …outside it. I'll show how to create a read only …property, and then complete this exercise by moving all the complex functionality …of doing calculations into my calculation utility class.…

I'm looking in the read only solution, and I'll start in the CalUtility.vb file. …Currently, I have the four functions, AddValues, SubtractValues and so on, …which are returning values directly from the functions. …I'm going to change this code so that instead of returning values, they're …simply setting a value. I'll add a new private field that I'll …call result with an underscore prefix. And as with the other fields, I'll set …the data type to double. Next, I'll declare a property named result.…