Checking if an Excel Workbook is open

Question

Is there a way to see if an Excel Workbook, say DataSheet.xls, is open (in use) or not? I would like to close that Workbook if it is opened.

Answer 1

Try this:

try
{
   Stream s = File.Open(FileName, FileMode.Open, FileAccess.Read, FileShare.None);

   s.Close();

   return true;
}
catch (Exception)
{
   return false;
}

This will tryand open the file exclusively. If the file is already open it will throw an exception, where you can then (try to) close it and carry on.