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This modification adds a check to avoid assigning a transaction to the wrong connection and throw an exception when this situation occurs. This prevents you from assigning a transaction from a different connection, for example:
DbConnection conn1
DbConnection conn2
DbCommand cmd1 = conn1.CreateCommand()
Dbcommand cmd2 = conn1.CreateCommand()
cmd1.Transaction = conn2.BeginTransaction()
ADO.NET will now throw an exception in the cmd.Transaction set{} if the new transaction is not derived from the expected connection.
