C# - NPOI Excel Number Format Not Showing In Excel Sheet?

I am trying to create double and number format cells in excel using NPOI library. I used code like

Dim cell As HSSFCell = row.CreateCell(j)
cell.SetCellValue(Double.Parse(dr(col).ToString))

In excel numbers are aligning right but when I check format it is showing in "General"

then I changed my code to like below

Dim cell As HSSFCell = row.CreateCell(j)
cell.SetCellValue(Double.Parse(dr(col).ToString))
Dim cellStyle As HSSFCellStyle = hssfworkbook.CreateCellStyle
cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("#,#0.0")
cell.CellStyle = cellStyle

Then While opening file it is giving error and also taking so long to open. But Excel format showing in "Number" error showing is like below.