CrossStitchCreator.PatternEditor.updateButton_Click C# (CSharp) Method

        private void updateButton_Click(object sender, EventArgs e)
        {
            if (patternList.SelectedIndices.Count > 0)
            {
                ListViewItem lvi = patternList.Items[patternList.SelectedIndices[0]];
                int imageIndex = patternList.SmallImageList.Images.IndexOfKey(lvi.ImageKey);
                patternList.SmallImageList.Images[imageIndex] = new Bitmap(mCurrentImage);
                Bitmap b = (Bitmap)colourBox.Image;
                lvi.BackColor = b.GetPixel(0, 0);
                Refresh();
            }
        }