Adding a Sheet to an Excel Workbook

Question

I'm trying to create a Workbook with multiple sheets in Excel but I can't figure out how to create the multiple sheets. I can create one just fine, but when I try to create a second one to write to I get an error.

Dim app As Application = New Application
Dim xlApp As New Excel.Application
Dim xlWorkBook As Excel.Workbook
Dim newXlApp As Excel.Application = New Microsoft.Office.Interop.Excel.Application
Dim newXlWorkbook As Excel.Workbook
Dim newXlSheet As Excel.Worksheet
Dim newXlSheet2 As Excel.Worksheet

Public Sub createWorkBook()
    newXlWorkbook = newXlApp.Workbooks.Add()

    newXlSheet = newXlWorkbook.Sheets("Sheet1")
    newXlSheet2 = newXlWorkbook.Sheets.Add("Sheet2")

    newXlSheet.Cells(1, 1) = "Task ID"
    newXlSheet.Cells(1, 2) = "Collective Tasks"
    newXlSheet.Cells(1, 3) = "Supported Task"

    newXlSheet2.Cells(1, 1) = "Parent Collective Task"
    newXlSheet2.Cells(1, 2) = "Individual Task"
End Sub

I'm not sure if it matters or not, but I also have a separate Excel Workbook open that I'm querying.

Answer 1

From what I can see the error your code is giving will be:

A first chance exception of type 'System.Runtime.InteropServices.COMException'

If you want to add multiple Sheets to your Excel Workbook this is the code to do that:

Dim app As New Excel.Application
Dim wb As Excel.Workbook = app.Workbooks.Add()
Dim ws As Excel.Worksheet

ws = CType(wb.Sheets.Add(Count:=10), Excel.Worksheet)

By default a Workbook comes with one Sheet . If you want to add more than one set the Count:= parameter . As you can see in my example I have used 10 . This will leave me with 11 Sheets to work with.

Note that ws will be the last sheet in the Workbook . In my example this would be Sheet11 .

If you want to work with each Worksheet then you would need to look at the following code:

Dim ws1 As Excel.Worksheet = CType(wb.Sheets(1), Excel.Worksheet)
Dim ws2 As Excel.Worksheet = CType(wb.Sheets.Add(), Excel.Worksheet)

ws1.Cells(1, 1) = "Task ID"
ws1.Cells(1, 2) = "Collective Tasks"
ws1.Cells(1, 3) = "Supported Task"

ws2.Cells(1, 1) = "Parent Collective Task"
ws2.Cells(1, 2) = "Individual Task"

Note that ws1 references to the first sheet. As said above a Workbook by default comes with one sheet.