public class ColumnRange : Xceed.Workbooks.NET.LinearRange<Column>, Xceed.Workbooks.NET.IRangeBase<Column>  

using( var workbook = Workbook.Create( "ColumnRange.xlsx" ) ) 
  { 
    // Gets the first Worksheet; a Workbook always contains at least 1 Worksheet. 
    var worksheet = workbook.Worksheets[ 0 ]; 

    // Gets the Columns B, C and D. 
    var columnRange = worksheet.Columns[ "B", "D" ]; 

    // Sets the columnRange's Background color to yellow. 
    columnRange.Style.Fill.BackgroundColor = Color.Yellow; 
 
    // Saves Workbook to disk; 
    workbook.Save(); 
  }