List<Account> accounts = ActivateAccount();

// Save merchant account & bank information into database
using (var context = new MyContext())
{
    try
    {
        context.Accounts.Attach(accounts);
        context.SaveChanges();
    }
    catch (Exception ex)
    {

    }
}

using (var context = new MyContext())
{
    try
    {
        foreach(var row in accounts){
            context.AddToAccounts(row);
        }
        context.SaveChanges();
    }catch (Exception ex){
        //Log any exception here.
    }
}

List<Account> accounts = ActivateAccount();

// Save merchant account & bank information into database
using (var context = new MyContext())
{
    try
    {
        context.Accounts.Add(accounts);
        context.SaveChanges();
    }
    catch (Exception ex)
    {

    }
}