I need to understand how the CalculateButton_Click method in my WPF application handles input validation and updates for HourlyEmployee and CommissionEmployee objects. Specifically, how does it check and manage errors for user inputs related to hours worked, wage rates, gross sales, and commission rates? The method involves parsing user input, validating ranges, and throwing exceptions if the inputs are invalid. Could you explain how this process is implemented in the provided C# code? Any insights into how input errors are managed and the validation logic used would be very helpful