OpenCL- OpenGL memory sharing C example

Hi,
I am a beginner in parallel programming.I am using NVIDIA GeForce 820M graphics card and want to send data from OpenCL to OpenGL using C language. I am using Visual Studio 2012. Is there any sample code or tutorial for this? I found this link https://developer.nvidia.com/opencl#oclSimpleGL but it is for GeForce8 or Tesla.