my object of itemmodel[] reference by gc root object ......

[analysisi]

the gc root object of type object[] references a itemmodel[] object

i try to take many snapshots to cleaned up ,my itemmodel[] instance, but still alive.

GC root objects which are only in memory because they are on the finalizer queue should be cleaned up next time the garbage collector runs. These objects are unlikely to indicate a memory problem, so are not shown on the graph by default.

[Chris.Allen]

It doesn't sounds like this object is on the finalizer queue so you will have to look at the references or your code that are keeping this referenced and nullify the references