the difference between decimals and doubles in C#

The decimal has a capacity for being more precise. It's "better" while taking up more memory as an expense for being so. There is also a type called a float which is the same sort of thing yet crummier (less memory, less impressive) than either the decimal or the double. For more see:

• http://stackoverflow.com/questions/618535/difference-between-decimal-float-and-double-in-net
• https://social.msdn.microsoft.com/Forums/vstudio/en-US/921a8ffc-9829-4145-bdc9-a96c1ec174a5/decimal-vs-double-difference?forum=csharpgeneral