Addition assignment operator += in NT

[frankduc]

Hi,

I am trying to make an addition of the volume inside a for loop:

double sumvolms = 0;

for(int barIndex = index; barIndex <= ChartBars.ToIndex; barIndex++)
                {
double vols =  Bars.GetVolume(barIndex);
sumvolms += vols;
                }

The sum returns a cumulative sum: 100+200+300+400
But i just want the last number 400 in the output window.

Is there a way to that?

thanks

[frankduc]

problem solve
sorry