Txn.cs

public void Txn(Action<MyContext> action)
{
    var dbContext = new MyContext();
    DbContextTransaction txn  = null;
    try
    {
        txn = dbContext.Database.BeginTransaction();
        action(dbContext);
        dbContext.SaveChanges();
        txn.Commit();
    }
    catch (Exception)
    {
        txn?.Rollback();
        throw;
    }
}