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

martin's answer does not work if Excel Application is not currently running. You may want to modifiy the code as following :

static bool IsOpened(string wbook)
{
    bool isOpened = true;
    Excel.Application exApp;

    try
    {
        // place the following line here :
        exApp = (Excel.Application)System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");
        // because it throws an exception if Excel is not running.
        exApp.Workbooks.get_Item(wbook);
    }
    catch (Exception)
    {
        isOpened = false;
    }
    return isOpened;
}

Thank you for your attention. Regards