I have an Excel VBA add-in with a public method in a bas file. This method currently creates a VB6 COM object, which exists in a running VB6 exe/vbp. The VB6 app loads in data and then the Excel add-in method can call methods on the VB6 COM object to load the data into an existing Excel xls. This is all currently working.
We have since converted our VB6 app to C#.
My question is: What is the best/easiest way to mimic this behavior with the C#/.NET app? I m thinking I may not be able to pull the data from the .NET app into Excel from the add-in method since the .Net app needs to be running with data loaded (so no using a stand-alone C# class library). Maybe we can, instead, push the data from .NET to Excel by accessing the VBA add-in method from the C# code?
The following is the existing VBA method accessing the VB6 app:

Public Sub UpdateInDataFromApp()
   Dim wkbInData As Workbook
   Dim oFPW As Object
   Dim nMaxCols As Integer
   Dim nMaxRows As Integer
   Dim j As Integer
   Dim sName As String
   Dim nCol As Integer
   Dim nRow As Integer
   Dim sheetCnt As Integer
   Dim nDepth As Integer
   Dim sPath As String
   Dim vData As Variant
   Dim SheetRange As Range

   Set wkbInData = wkbOpen("InData.xls")

   sPath = g_sPathXLSfiles & ""

    Note:  the following will bring up fpw app if not already running
   Set oFPW = CreateObject("FPW.CProfilesData")

   If oFPW Is Nothing Then
      MsgBox "Unable to reference " & sApp
   Else
          .
          .
          .      
      sheetCnt = wkbInData.Sheets.Count  get number of sheets in indata workbook
      For j = 2 To sheetCnt  set counter to loop over all sheets except the first one which is not input data fields
          With wkbInData.Worksheets(j)
             Set SheetRange = .UsedRange
          End With
          With SheetRange
             nMaxRows = .Rows.Count     get range of sheet(j)
             nMaxCols = .Columns.Count  get range of sheet(j)
             Range(.Cells(2, 2), .Cells(nMaxRows, nMaxCols)).ClearContents  Clears data from data range (51 Columns)
             Range(.Cells(2, 2), .Cells(nMaxRows, nMaxCols)).ClearComments
          End With
          With oFPW  vb6 object
             For nRow = 2 To nMaxRows   loop through rows
                sName = SheetRange.Cells(nRow, 1)  Field name
                vData = .vntGetSymbol(sName, 0)    Check if vb6 app identifies the name

                nDepth = .GetInputTableDepth(sName)  Get number of data items for this field name from vb6 app
                nMaxCols = nDepth + 2  nDepth=0, is single data item
                For nCol = 2 To nMaxCols  loop over deep screen fields
                   nDepth = nCol - 2      current depth
                   vData = .vntGetSymbol(sName, nDepth)  Get Data from vb6 app
                   If LenB(vData) > 0 And IsNumeric(vData) Then   Check if data returned
                      SheetRange.Cells(nRow, nCol) = vData    Poke the data in
                   Else
                      SheetRange.Cells(nRow, nCol) = vData    Poke a zero in
                   End If

                Next  nCol
             Next  nRow
          End With
          Set SheetRange = Nothing
      Next  j

  End If

  Set wkbInData = Nothing
  Set oFPW = Nothing
Exit Sub
    .
    .
    .
End Sub  

Any help would be appreciated.