public class CellRange : Xceed.Workbooks.NET.StyledRange<Cell>, Xceed.Workbooks.NET.IRangeBase<Cell>  

using( var doc = Workbook.Load( "test.xlsx") )

  {

    var worksheet = doc.Worksheets[ 0 ];        

    var firstTableCellRange = worksheet.Tables[ 0 ].CellRange;



    var cellRangeStartCell = firstTableCellRange.StartingElement;

    var cellRangeEndCell = firstTableCellRange.EndingElement;

  }