How to close-without-save an Excel /xlsm workbook, w/ a custom function, from C#

When you use the Excel objects, be sure to close the workbook like this:

Excel.Application xlApp ;
Excel.Workbook xlWorkBook ;
Excel.Worksheet xlWorkSheet ;
object misValue = System.Reflection.Missing.Value;

xlApp = new Excel.ApplicationClass();
xlWorkBook = xlApp.Workbooks.Add("Yourworkbook");

xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);

....do your stuff

xlWorkBook.Close(false, misValue, misValue);

xlApp.Quit();

The false in the close method indicates don’t save changes.