Microsoft.Office.Interop.Excel.ApplicationClass has no constructor defined

Question

I tried to follow How to open an Excel file in C# tutorial, i.e. added a reference on the Com tab to Microsoft Office 14.0 Object Library and tried to compile code:

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

xlApp = new Excel.ApplicationClass();//error here
//...

and faced a compile-time error, saying

There is no constructor defined for Microsoft.Office.Interop.Excel.ApplicationClass type.

What am I missing?

Answer 1

Try this:

Excel._Application xlApp = new Excel.Application();