SqlTransaction.Rollback() does not throw InvalidOperationException in case the transaction has already been rolled back.

Question

According to
MSDN SqlTransaction.Rollback() method must throw InvalidOperationException in case the transaction has already been committed or rolled back. 
However, in my tests I don't get any exceptions. Here is the code:
CREATE PROCEDURE dbo.USP_TEST_TX_PROC
AS
BEGIN
SELECT 1/0;
ROLLBACK TRANSACTION;
END
GO
using(SqlConnection con = new SqlConnection(@"Data Source=XXX;Initial Catalog=TestDB;Integrated Security=True"))
con.Open();
SqlTransaction tr = con.BeginTransaction();
SqlCommand cmd = new SqlCommand("dbo.USP_TEST_TX_PROC", con, tr) { CommandType = CommandType.StoredProcedure};
try
cmd.ExecuteNonQuery();
tr.Commit();
catch (Exception ex)
try
tr.Rollback();
catch (Exception ex2)
Console.WriteLine(" Message: {0}", ex2.Message);
What am I doing wrong?
Thank you.
Alexey

Answer 1

Hello Alexey,
I created a client side demo which could throw the InvalidOperationException:
using (SqlConnection connection = new SqlConnection(@"Server=(localdb)\Projects;Database=DFDB;Trusted_Connection=True;"))
connection.Open();
SqlCommand command = connection.CreateCommand();
SqlTransaction transaction;
transaction = connection.BeginTransaction("SampleTransaction");
command.Connection = connection;
command.Transaction = transaction;
try
command.CommandText = "ProInsertIntoOrder 1,'1'";
command.ExecuteNonQuery();
transaction.Rollback();
throw new Exception();
catch (Exception ex)
// Attempt to roll back the transaction.
try
transaction.Rollback();
catch (InvalidOperationException ex2)
Console.WriteLine("Rollback Exception Type: {0}", ex2.GetType());
Console.WriteLine(" Message: {0}", ex2.Message);
You could have a try. However, it is not clear why it could detect the ROLLBACK statement on the server side, I suggest that you could post this feedback to:
https://connect.microsoft.com/VisualStudio/feedback/LoadSubmitFeedbackForm
Regards.
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