Progress! Daniel, you didn't tell me that these attributes had to be in the markup to fire the code-behind methods:
I found them in one of the mini-projects you sent me, so thanks for that. Now, the formatting code you shot me:
|myStyle.NumberFormat.Attributes.Add( "ss:Format", "$#" )
is producing values in the Excel spreadsheet without commas, like "$123456" and where the value was 0, it is now merely "$." Is there a source for these formatting codes I can look up myself? Like, what is the syntax for comma-delimited groupings of 3 and how to keep the original 0 in the cell so it displays as "$0"?