title: Set format of Excel sheet cell from General to Number using NPOI library
body: <pre><code>  currentRow.CreateCell(columnIndex).CellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("#,##0");
  </code></pre>
  
  <p>I have written above line but it does not set format of excel sheet cell from general to number .It always remain general</p>