Assigning number formats to ranges. (EntireColumn)

Two questions: Is there are particular order in which to assign a number format to a cell? Or could there be an issue using EntireColumn to assign number formats? For example, what I''m trying to accomplish is the following: // Format Columns mySheet.Range[ "A1" ].EntireColumn.NumberFormat = "@"; mySheet.Range[ "B1:C1" ].EntireColumn.NumberFormat = "mm/dd/yyyy"; mySheet.Range[ "D1" ].EntireColumn.NumberFormat = "@"; mySheet.Range[ "E1:F1" ].EntireColumn.NumberFormat = "#,##0.00"; mySheet.Range[ "G1:H1" ].EntireColumn.NumberFormat = "@"; mySheet.Range[ "I1" ].EntireColumn.NumberFormat = "0.000"; mySheet.Range[ "J1" ].EntireColumn.NumberFormat = "mm/dd/yyyy"; mySheet.Range[ "K1:P1" ].EntireColumn.NumberFormat = "#,##0.00"; mySheet.Range[ "Q1" ].EntireColumn.NumberFormat = "@"; mySheet.Range[ "R1" ].EntireColumn.NumberFormat = "#"; ---- I''ve tried doing this before inserting data and also after. If I assign a number format to a particular cell, I have no issues. I use the following code to do this: mySheet.Range[ currentRow,14 ].NumberFormat = "#,##0.00"; Thanks for your help.