public OleDbTransaction Begin(IsolationLevel isolevel)
{
if (null == _transaction)
{
throw ADP.TransactionZombied(this);
}
else if ((null != _nestedTransaction) && _nestedTransaction.IsAlive)
{
throw ADP.ParallelTransactionsNotSupported(Connection);
}
// either the connection will be open or this will be a zombie
OleDbTransaction transaction = new OleDbTransaction(_parentConnection, this, isolevel);
_nestedTransaction = new WeakReference(transaction, false);
UnsafeNativeMethods.ITransactionLocal wrapper = null;
try
{
wrapper = (UnsafeNativeMethods.ITransactionLocal)_transaction.ComWrapper();
transaction.BeginInternal(wrapper);
}
finally
{
if (null != wrapper)
{
Marshal.ReleaseComObject(wrapper);
}
}
return(transaction);
}
public OleDbTransaction Begin(IsolationLevel isolevel)
{
OleDbConnection.ExecutePermission.Demand(); // MDAC 81476
IntPtr hscp;
Bid.ScopeEnter(out hscp, "<oledb.OleDbTransaction.Begin|API> %d#, isolevel=%d{IsolationLevel}", ObjectID, (int)isolevel);
try {
if (null == _transaction)
{
throw ADP.TransactionZombied(this);
}
else if ((null != _nestedTransaction) && _nestedTransaction.IsAlive)
{
throw ADP.ParallelTransactionsNotSupported(Connection);
}
// either the connection will be open or this will be a zombie
OleDbTransaction transaction = new OleDbTransaction(_parentConnection, this, isolevel);
_nestedTransaction = new WeakReference(transaction, false);
UnsafeNativeMethods.ITransactionLocal wrapper = null;
try {
wrapper = (UnsafeNativeMethods.ITransactionLocal)_transaction.ComWrapper();
transaction.BeginInternal(wrapper);
}
finally {
if (null != wrapper)
{
Marshal.ReleaseComObject(wrapper);
}
}
return(transaction);
}
finally {
Bid.ScopeLeave(ref hscp);
}
}