I created a VFP MTDLL that does some fairly simple operations. I added it to my ASP.NET project, compiled everything, it runs fine.

If I hit [F5] in the browser to refresh, things still come back fine.

However, if I hold down [F5] to 5-6 seconds to simulate a lot of concurrent requests, eventually I only see a blank page while "the IE ball spins". I have to restart IIS in order to get a good response again.

Just to test things out further, I put the MTDLL inside a COM+ application and viewed the object reference count. I can see the reference count increase after I hold down [F5] in the browser, but the refs never decrease.

I have the ASPCOMPAT="true" directive in the top of my .aspx page.

My simple COM object test page looks like this:

devcom.TestMeClass devCom = new devcom.TestMeClass();
devCom.ProcessReq( _sWriter.ToString() );
string retVal = devCom.OUTPUTFINAL.ToString();
devCom = null;
return retVal;

Here is what is at the top of my MTDLL main.prg:

#INCLUDE SC.H
#INCLUDE VFP.H
#DEFINE CRLF	Chr(13)+Chr(10)

Define Class TestMe as Session OlePublic

Function Init
Local ;
	pathString as String , ;
	nothing as Variant
	nothing = Sys(2340,1)
	Set Cpdialog Off
	Set Safety Off
	Set Exclusive Off
	Set Multilocks On
	Set Deleted Off
	Set Collate To "MACHINE"
	Set Date to ANSI
	Set Century On
	Set Mark to "."
	Set Near On
	Set Exact Off
	Set Ansi Off
	Set TextMerge Delimiters To "{{","}}" 
	This.dllPath = Lower( JUSTPATH(_VFP.Servername) )
	This.xDomDoc = CreateObject("Msxml2.FreeThreadedDOMDocument.4.0")
	if ( Left(This.LoadConfig() , 1 ) ="!" )
	Return .f.
	endif
	if ( This.SetTempDirectory() = "0" )
	Return .f.
	EndIf
	pathString = ( This.dllPath )+ ";" + ( JustPath(This.dbcPath) )
	Set Path to &pathString
	Return .t.
EndFunc