ActiveWorkbook Returning NULL Error

May 17, 2009

I'm developing an excel addin using Visual Studio 2008. At the moment i'm trying to display a popup showing the value contained in cell A1. However, i'm getting a runtime error saying that xlWorkBook is null. I've been able to get this to work if i open a workbook but i want to be able to execute my code on the currently active workbook. I thought that ActiveWorkbook (also tried ThisWorkbook) would let me do this but i'm having no success.


using Excel = Microsoft.Office.Interop.Excel;
using Office = Microsoft.Office.Core;
...
...
Excel.Application xlApp;
Excel.Workbook xlWorkBook;
Excel.Worksheet xlWorkSheet;

xlApp = new Excel.ApplicationClass();
xlWorkBook = (Excel.Workbook) xlApp.ActiveWorkbook;
xlWorkSheet = (Excel.Worksheet) xlWorkBook.Worksheets.get_Item(1);

MessageBox.Show(xlWorkSheet.get_Range("A1", "A1").Value2.ToString());

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