How to Export Excel font size and format Excel in XLWorkbook asp.net(VB)

Dim dt As New DataTable("Worktime")
		For Each cell As TableCell In gv_data.HeaderRow.Cells
			dt.Columns.Add(cell.Text)
		Next
		For Each row As GridViewRow In gv_data.Rows
			dt.Rows.Add()
			For i As Integer = 0 To row.Cells.Count - 1
				dt.Rows(dt.Rows.Count - 1)(i) = row.Cells(i).Text
			Next
		Next
		Using wb As New XLWorkbook()
			wb.Worksheets.Add(dt)
			
			Response.Clear()
			Response.Buffer = True
			Response.Charset = ""
			Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
			Response.AddHeader("content-disposition", "attachment;filename=ABCD.xlsx")
			Using MyMemoryStream As New MemoryStream()
				wb.SaveAs(MyMemoryStream)
				MyMemoryStream.WriteTo(Response.OutputStream)
				Response.Flush()
				Response.[End]()
			End Using
		End Using