Parallel.For(): Update variable outside of loop

Question

I\'m just looking in to the new .NET 4.0 features. With that, I\'m attempting a simple calculation using Parallel.For and a normal for(x;x;x) loop.

Answer 1

if there are two parameters in this code. For example

long sum1 = 0;
long sum2 = 0;

Parallel.For(1, 10000, y =>
    {
        sum1 += y;
        sum2=sum1*y;
    }
);

what will we do ? i am guessing that have to use array !