I'll just refer to
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&threadm=9DEB3050-8CBF-4E69-BC
9B-9FD22E8AE536%40microsoft.com&rnum=3&prev=/groups%3Fq%3Dexcel%2520quit%2520int
erop%2520process%2520asp.net%26num%3D20%26hl%3Den%26lr%3D%26ie%3DUTF-8%26sa%3DN%
26tab%3Dwg
and ask if the problem has got a solution yet..

I've got the following code  in a class library, and it doesn't release
Excel.exe when called from ASP.NET. Fifty page requests, and the server is
out of memory... That's nice :)

Any help to make it make Excel go away would be very much appreciated. :)

L-E

public int GetSheetCount(string path)
{

Application app = null;
Workbook wb = null;
int iRet = 0;
Exception outerEx = null;
try
{
   // Culture hack...
   System.Globalization.CultureInfo ciOld =
System.Threading.Thread.CurrentThread.CurrentCulture;
   System.Threading.Thread.CurrentThread.CurrentCulture = new
System.Globalization.CultureInfo("en-US");
   // End cult. hack. 1

   app = new ApplicationClass();
   app.DisplayAlerts = false;
   app.Visible = false;

   wb = app.Workbooks.Open(path, Missing.Value, Missing.Value,
Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value,
Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
   iRet = wb.Worksheets.Count;
   wb.Close(false, Missing.Value, Missing.Value);

   // Culture hack
   System.Threading.Thread.CurrentThread.CurrentCulture = ciOld;
   // End cuilt. hack 2
}
catch(Exception ex)
{
outerEx = ex;
}

Marshal.ReleaseComObject(wb);
wb = null;

app.Quit();
Marshal.ReleaseComObject(app);
app = null;

GC.Collect();
GC.WaitForPendingFinalizers();

// Excel process still active... ReleaseComObject() == 0 for both

if (outerEx != null)
throw(outerEx);

return iRet;

}