Use this convention (assuming that the file is on the same dir as the asp page):

<%
Dim objConn, ConnStr
Dim dbLoc
Set objConn = Server.CreateObject("ADODB.connection")
dbLoc=server.mappath("agweb.dbc")
ConnStr= "Driver=Microsoft Visual Foxpro Driver; " + _
"UID=;SourceType=DBC;SourceDB=" + dbLoc
objConn.Open ConnStr
%>

Oh, make sure you can set the properties of the file to be read/write (some hosts will not let you do this.... Another thing is to put the dbc in its own subdirectory. Hope this helps!