Column Cells
var workbook = new XLWorkbook();
var ws = workbook.Worksheets.Add("Column Cells");
var columnFromWorksheet = ws.Column(1);
columnFromWorksheet.Cell(1).Style.Fill.BackgroundColor = XLColor.Red;
columnFromWorksheet.Cells("2").Style.Fill.BackgroundColor = XLColor.Blue;
columnFromWorksheet.Cells("3,5:6").Style.Fill.BackgroundColor = XLColor.Red;
columnFromWorksheet.Cells(8, 9).Style.Fill.BackgroundColor = XLColor.Blue;
var columnFromRange = ws.Range("B1:B9").FirstColumn();
columnFromRange.Cell(1).Style.Fill.BackgroundColor = XLColor.Red;
columnFromRange.Cells("2").Style.Fill.BackgroundColor = XLColor.Blue;
columnFromRange.Cells("3,5:6").Style.Fill.BackgroundColor = XLColor.Red;
columnFromRange.Cells(8, 9).Style.Fill.BackgroundColor = XLColor.Blue;
workbook.SaveAs("ColumnCells.xlsx");