SessionID in ASP.NET MVC

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session Id every 2-3 request will be changes shouldn't it remain the same because : ASP.NET keeps assigning new session ids until you place something into the Session variable 

Session.SessionID
so you can't use it for make it use Session Start and save a variable on Session. Like this : 

void Session_Start(object sender, EventArgs e) {
  session["SessionID"] = Guid.NewGuid().ToString();
}

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