Codesgure,

firstly I'd like to congratulate you for a job well done.

Since you are asking for feeback, I'd like to raise one. on your lesson 12, you defined the following:

double Volume[]
This function returns a double type value holds the average of the total amount of currency traded within a period of time, usually one day.
For example: Volume [0] will return this average for the current bar.

I'm not too sure if this is correct. Volume[0] normally means the first tick of the new bar. It's basically the first quote (or tick) at the beginning of new bar. For example, on an hourly chart, it's the first tick for the new hour.

I also thought initially that Volume is the quantity traded for the day (if it's a day chart); but it's nothing to do with that.

Cheers!