Accessing an open Excel Workbook in C#

Question

I need to access an excel file that is already open. I thought just inspecting the .Workbooks property that it would be there but it isn\'t. What is the right w

Answer 1

Instead of instantiating a new instance, check for an existing one:

try
{
  Microsoft.Office.Interop.Excel.Application app = 
      System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");
}
catch
{
  // Excel is not running.
}