dim strPeriod as string = dtTransdate.ToString("dd-MMM-yyyy", System.Globalization.DateTimeFormatInfo.InvariantInfo)

'--excel code
.Range("H2").Value = strPeriod

When I read the excel, the column show "Apr-06" , seems correct , however ( it is a date format column), I try to change into string format in excel but still fail.

Then , I try to put "'"
.Range("H2").Value = "'" & strPeriod
It is string format in Excel BUT when user do some sorting . (it change back into date format as shown as 01-Apr-2006 or 808354 (some strange integer)

Please help