public boolean addColumn(String sheetName,String colName){
		
		
		try{				
			fis = new FileInputStream(path); 
			workbook = new XSSFWorkbook(fis);
			int index = workbook.getSheetIndex(sheetName);
			if(index==-1)
				return false;
			
		XSSFCellStyle style = workbook.createCellStyle();
		style.setFillForegroundColor(HSSFColor.GREY_40_PERCENT.index);
		style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		
		sheet=workbook.getSheetAt(index);
		
		row = sheet.getRow(0);
		if (row == null)
			row = sheet.createRow(0);
		
		
		if(row.getLastCellNum() == -1)
			cell = row.createCell(0);
		else
			cell = row.createCell(row.getLastCellNum());
	        
	        cell.setCellValue(colName);
	        cell.setCellStyle(style);
	        
	        fileOut = new FileOutputStream(path);
			workbook.write(fileOut);
		    fileOut.close();		    

		}catch(Exception e){
			e.printStackTrace();
			return false;
		}
		
		return true;
		
		
	}