Adding series to LegendItem

Question

I want to use chart.Series[0].LegendText = "New Sheet"; in LegendItem

something like

LegendItem Newseries = new LegendItem();

LegendItem newcell = new LegendCell(LegendCellType.Text, "New sheet = " + chart.Series[0].LegendText, ContentAlignment.BottomCenter); //Error