Decimal Data Formate like("0.00") in excel cell using c# and npoi dll

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C#

I am creating excel file and show the data by datatable fetch by c# code to sql server. the data is comming in non formated type like -1 ,1.23,1.3,3.5,4,6
i want to show it in the same format like
1.00
1.23
1.30
3.50
4.00
6.00

my code is here

HSSFWorkbook workBook = new HSSFWorkbook();

var sheet = workBook.CreateSheet("OverAll");
                       var rowIndex = 2;

var avgCellFormate = workBook.CreateDataFormat();
                        var dataFormate = avgCellFormate.GetFormat("0.00");
                        var avgCellStyle = workBook.CreateCellStyle();
                        avgCellStyle.DataFormat = dataFormate;

row14Cells = row14.CreateCell(2);
                               row14Cells.SetCellValue(dr["Average"].ToString());
                               row14Cells.CellStyle = avgCellStyle;

Please give me Solution.
Thanks....