Can not compile - Format field in System.data.services.client.dataservicecontext class not found

  I have an existing code which refers the class in the following link  

http://msdn.microsoft.com/en-us/library/system.data.services.client.dataservicecontext(v=vs.113).aspx

 There is a line of code which access the "Format" field of the dataservicecontext class.

 I am using VS 2012 on Win 8 64 bit. My Project setting is to build for any cpu and VS "About" shows .net Framework version 4.5.51641. I added reference to the Microsoft.Data.Services.Client.dll to compile the code.

 Compilation fails as it can not find the "Format" field which is defined in the .net class mentioned in the link above.

Can someone please help to fix the issue ? Which version of Microsoft.Data.Services.Client.dll should be used 

Thanks