Copy and paste following as it is to post build event:
"C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin\NETFX 4.0 Tools\GacUtil.exe" /nologo /i "$(TargetPath)" /f
copy "$(TargetPath)" "C:\Program Files (x86)\Microsoft BizTalk Server 2010\Pipeline Components" /y
Reference1
