Question

I created a sqlconnection, CN1. Then this CN1 is opened. Later in the code there is a transactionscope. If I execute a sql command on this CN1 connection, is this within transaction?

Code looks like this;

SqlConnection cn1 = new SqlConnection();
cn1.Open(); //connection opened when there is no ambient transaction.
...

using(TransactionScope scope = new TransactionScope())
{
  SqlCommand cmd; //a typical sql command.

  ...

  cmd.ExecuteNonQuery(); //Is this command within transaction?
  ...
}

Answer 1

It is a MUST to open the connection within the TransactionScope to ensure that the connection is enrolled in the transaction.

This is found in the comment just above the connection.Open in this MSDN example.