SqlTransaction trans=null;
try
{
  using (trans = connection.BeginTransaction())
  {
      //...
      trans.Commit()
  }
}
catch (...)
{
  trans.Rollback();
}

try
{
  using (TransactionScope scope = new TransactionScope())
  {
    scope.Complete();
  }
}
catch (...)
{
  //...
}

TransactionScope scope = null;
try
{
  using (scope = new TransactionScope())
  {
    scope.Complete();
  }
}
catch (...)
{
  scope .Dispose();
}