C# - Large Object Heap

Large Object Heap

Objects larger than some 85,000 bytes get allocated on a separate heap, called the large object heap. This heap has one special characteristic: it never gets compacted, because that would be too costly, moving those large objects would take too long. Without compaction, there are many situations, both theoretical and practical, that may and eventually will lead to an out-of-memory situation due to fragmentation.
StringBuilder in C# 4.0 this issue is fixed by using linked list.