NumFormat
type NumFormat = General | 0 | 0.00 | #,##0 | #,##0.00 | 0% | 0.00% | 0.00E+00 | # ?/? | # ??/?? | m/d/yyyy | d-mmm-yy | d-mmm | mmm-yy | h:mm AM/PM | h:mm:ss AM/PM | h:mm | h:mm:ss | m/d/yyyy h:mm | #,##0_);(#,##0) | #,##0_);[Red](#,##0) | #,##0.00_);(#,##0.00) | #,##0.00_);[Red](#,##0.00) | mm:ss | [h]:mm:ss | mm:ss.0 | ##0.0E+0 | @Description
Standard numeric format.
Try It
oWorksheet.GetRange("A1").SetOrientation("xlUpward");