How to find out size of session in ASP.NET from web application?

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If you’re trying to get the size of Session during runtime rather than in debug tracing, you might want to try something like this:

long totalSessionBytes = 0;
BinaryFormatter b = new BinaryFormatter();
MemoryStream m;
foreach(var obj in Session) 
{
  m = new MemoryStream();
  b.Serialize(m, obj);
  totalSessionBytes += m.Length;
}

(Inspired by http://www.codeproject.com/KB/session/exploresessionandcache.aspx)

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