This three lines of code is what we use when we want to really force a garbage collection:
We have profiled the grid many times with this GC code, but we could not find a memory leak as you describe.
If you think that you have found a memory leak, can you please provide a runnable sample project that clearly demonstrates that the grid is indeed leaking with time. We will profile it with JustTrace to see what is leaking and where.
Thanks in advance.
All the best,
the Telerik team