May try this for your code:
But this is spoon feed have you tried Google. You need to iterate through the nodes in web.config.
set xmlDoc=server.CreateObject("Microsoft.XMLDOM")
set xmlappSettings=server.CreateObject("Microsoft.XMLDOM")
set xmladd=server.CreateObject("Microsoft.XMLDOM")
xmlDoc.async="false"
xmlDoc.load(server.MapPath ("web.config"))
set xmlappSettings = xmldoc.GetElementsByTagName("appSettings").Item(0)
set xmladd = xmlappSettings.GetElementsByTagName("add")
for each x in xmladd
'Check for the Atrribute Value
if x.getAttribute("key") ="ConnectionString1" then
Response.write(x.getAttribute("value"))
end if
next
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