The following function is a function of obtaining a file size, and the implementation is as follows:
<%
'Company: Sabra Inc
'Author: Dave Hoffenberg
'Function: Retrieves File Size (k) of any file name passed to it.
'Freeware
Function ShowFileSize (filespec)
FILE = Server.mappath (filespec)
SET FSO = CreateObject ("scripting.filesystemObject")
If fso.fileexists (file) THEN
Set f = fso.getfile (file)
INTSIZEB = f.size
INTSIZEK = INT ((INTSIZEB / 1024) .5)
IF INTSIZEK = 0 THEN INTSIZEK = 1
ShowFilesize = INTSIZEK & "K"
Else
ShowFileSize = "File Doesn't Exist"
END IF
SET FSO = Nothing
END FUNCTION
Response.Write ShowFileSize ("Test.txt")
%>