Serialized format of of session data

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.NET

.NET4

SQL-Server-2012

In which format the SessionItemShort(varbinary) is deserialized in ASPStateTempSessions table.

I am trying to deserialize in this format,

public ActionResult Home()
        {
            
            ViewBag.Result = Session["username"];
            SqlConnection con = new SqlConnection("Data Source=WSLK1GF-001;Initial Catalog=ASPState;Integrated Security=True");
            con.Open();
            string val = Session.SessionID;
            string query="select SessionItemShort from ASPStateTempSessions where SessionId LIKE '"+Session.SessionID+"%'";
            SqlCommand cmd=new SqlCommand(query,con);
            SqlDataReader dr = cmd.ExecuteReader();
            dr.Read();
            byte[] b1 = new byte[0]; //slot to hold raw data in ms/sql varbinary format
            byte[] b2 = new byte[0];
            b1 = (byte[])dr["SessionItemShort"];
            string s = Server.UrlEncode(Encoding.ASCII.GetString(b1));
            b2 = Encoding.ASCII.GetBytes(s);
            MemoryStream ms = new MemoryStream(b2);
            BinaryFormatter bf = new BinaryFormatter();
            ms.Write(b2, 0, b2.Length);
            ms.Seek(0, SeekOrigin.Begin);
            LoginSession ls = null;
            object obj=null;
            try
            {
                obj = (LoginSession)bf.Deserialize(ms);
            }
            catch(Exception ea)
            {
                Response.Write(ea);
                ms.Close();
            }
            ViewBag.Ses = obj;
            return View();
        }

I got an error like this:

The input stream is not a valid binary format.
The starting contents (in bytes) are: 25-31-34-25-30-30-25-30-30-25-30-30-25-30-31-25-30