Well it’s pretty late here (almost 1 o’clock at night) and I’m still working.
Just spent 15 minutes looking for a small DLL which I couldn’t find.
Where Is It?
The Microsoft.SharePoint.Client.ServerRuntime.dll appears to not be in the standard directories — at least I didn’t find it there.
The simple thing to do is to copy/paste the path below and you’re good to go on creating custom WCF:
C:\Windows\assembly\GAC_MSIL\Microsoft.SharePoint.Client.ServerRuntime\14.0.0.0__71e9bce111e9429c\Microsoft.SharePoint.Client.ServerRuntime.dll
Stupid? Maybe. But it did the job and references the file correctly. 🙂
Hope it helps someone.