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;
  }