How to indicate that a method was unsuccessful

Question

I have several similar methods, say eg. CalculatePoint(...) and CalculateListOfPoints(...). Occasionally, they may not succeed, and need to indicate this to the caller. For

Answer 1

Well with Point, you can send back Point.Empty as a return value in case of failure. Now all this really does is return a point with 0 for the X and Y value, so if that can be a valid return value, I'd stay away from that, but if your method will never return a (0,0) point, then you can use that.