Question

Is it possible to get the size(in bytes) of a Session object after storing something such as a datatable inside it?

I want to get the size of a particular Session object, such as Session["table1"], not the whole Session collection, so the other question, while helpful, is not quite a duplicate.

Answer 1

You can use marshalling to create a copy of the object, that would give you an approximate number on how much memory it uses.

But, as always it s impossible to give an exact figure of the memory usage. A DataTable object is not a single solid piece of memory that you can measure. It contains a lot of objects and they have references between them, and there may be several references to the same object which means that there isn t one copy of the object for each reference to it. Each DataRow for example has a reference to the table that it belongs to, but that of course doesn t mean that each row has a complete copy of the entire table.

Answer 2

You could use reflection, see this article.

You might also want to consider having a look at some Memory Performance Counters or perhaps profiling your application with a tool such as DotTrace or the CLR Profiler.

Answer 3

Maybe you can use external tools like CLR Profiler or VSTS Profiler to check it.

Answer 4

This is taken almost line-for-line from the "duplicate question" from the first comment in the question.

int totalSessionBytes;
BinaryFormatter b = new BinaryFormatter();
MemoryStream m;
b.Serialize(m, Session["table1"]);
totalSessionBytes = m.Length;

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