Question

Im doing this:

long[] HistogramValues = Form1.GetHistogram(bitmap);
Form1.Histograms.AddRange(HistogramValues);

But then Histograms contain also 256 values like HistogramValues.
I want that in Histograms in index [0] there will be 256 values from HistogramValues then in [1] also 256 values then [2] and so on.

Histograms is a List

Answer 1

What you need is a list of arrays

List<long[]> Histograms = new List<long[]>();

And then add the arrays

long[] HistogramValues = Form1.GetHistogram(bitmap);
Form1.Histograms.Add(HistogramValues);