need a prediction algorithm

[student_learner]

i am trying to make an application which would predict the value of investments such as shares based on the past values, and help the user to choose the better option.
want some suggestions on the fuzzy algorithms that i can use in my project.

it would be a form based application and coding would be done in C#.

[WaltP]

This is a programming forum, not an investment forum. What you are asking is information on investments. Best to check elsewhere and come back with your attempt at programming the algorithm(s) you find.

[firstPerson]

You can look at previous days/weeks/months/years data and observe the context at which the price was stated and then look at the current situation of the stock/company then make a educated prediction based on the information.