Excel Interop - Add a new worksheet after all of the others

Question

I am trying to add a new worksheet to an Excel workbook and make this the last worksheet in the book in C# Excel Interop.

It seems really simple, and I thought the below code would do it:

using System.Runtime.InteropServices; using Excel = Microsoft.Office.Interop.Excel;  namespace ConsoleApplication2 {     class Program     {         static void Main(string[] args)         {             var excel = new Excel.Application();              var workbook = excel.Workbooks.Open(@"C:\test\Test.xlsx");             workbook.Sheets.Add(After: workbook.Sheets.Count);              workbook.Save();             workbook.Close();              Marshal.ReleaseComObject(excel);         }     } } 

No such luck. I get this helpful error:

COMException was unhandled - Exception from HRESULT: 0x800A03EC

I found this page on Microsoft.com which suggested I try and add the sheet first and then move it so I tried that as shown below. I know that this webpage targets Excel 95 but the VBA is still there to use so I was hoping it would still work:

using System.Runtime.InteropServices; using Excel = Microsoft.Office.Interop.Excel;  namespace ConsoleApplication2 {     class Program     {         static void Main(string[] args)         {             var excel = new Excel.Application();              var workbook = excel.Workbooks.Open(@"C:\test\Test.xlsx");             workbook.Sheets.Add();             workbook.Sheets.Move(After: workbook.Sheets.Count);              workbook.Save();             workbook.Close();              Marshal.ReleaseComObject(excel);         }     } } 

I get the same error as above. I have also tried passing the name of my last worksheet as a string as the After parameter in both the Add and Move methods, no joy!

That is what I have tried, so my question is how do I add a worksheet to an Excel workbook and make this the last sheet in the workbook using C# Excel Interop?

Thanks

Answer 1

Looking at the documentation here http://msdn.microsoft.com/en-us/library/microsoft.office.tools.excel.worksheet.move(v=vs.80).aspx, it indicates that the 'after' object isn't a numerical position; it's the object representing the sheet you want to position your sheet after. The code should probably be something like (untested):

workbook.Sheets.Add(After: workbook.Sheets[workbook.Sheets.Count]);  

Answer 2

This should do the job:

wSheet.Move(Missing.Value, workbook.Sheets[workbook.Sheets.Count]);