"How difficult is it to write programs using C# within Ninja Trader."
-> Its like a blind man trying to find a black cat in a dark room that isn't there!
First it takes a lot of development time devising the algorithms and even more time still testing them. Equities is harder than forex due to the gap up or down overnight which is not perceivable in the data. If the alg profits on historic data that's no guarantee it will profit on future data.
It is not as simple as devising buy/sell signals. The same problem's exist for a robot as for a human. eg when to switch from long to short? When to stop loss or average down? When to take profit or average up?
99.9% of all robotic trading done on the markets is not about trading stocks or forex for profits. It merely automates moving capital in/out of markets, stocks and sectors discretely.
switchmullet is right. Its quicker to craft an effective means of making money from trading stocks.
It you want to look a a genuine automated long term forex trading system, I suggest checking out: http://www.indextrader.com.au/
