asp.net - .NET webservice pdb deployed still no line numbers -

if can 1 appreciate it, have searched , built while.

1. website project
2. build using ccnet
3. built using msbuild , config debugtype=pdbonly
4. merge files single assembly using aspnet_merge , -a -debug
5. pdb in same directory .dll
6. debug=true in web.config
7. no impersonation going on
8. framework 4.0 (still checked, no reference deployment)
9. captured via ex.tostring()

sample stack trace

system.invalidcastexception: conversion type 'dbnull' type 'integer' not valid. @ microsoft.visualbasic.compilerservices.conversions.tointeger(object value) @ usercontrols_opportunitymanagement.getreferralmethodidbydialednbr(string dialednumber)