Entity framework 5.0 handle optimistic concurrency exception?

When handling several potential exceptions during a context.SaveChanges() one of the exceptions is OptimisticConcurrency. Microsoft's documentation on this at http://msdn.microsoft.com/en-us/library/bb399228.aspx discusses this for EF 4.x ...

try
{
    // Try to save changes, which may cause a conflict.
    int num = context.SaveChanges();
    Console.WriteLine("No conflicts. " +
        num.ToString() + " updates saved.");
}
catch (OptimisticConcurrencyException)
{
    // Resolve the concurrency conflict by refreshing the 
    // object context before re-saving changes. 
    context.Refresh(RefreshMode.ClientWins, orders);

    // Save changes.
    context.SaveChanges();
    Console.WriteLine("OptimisticConcurrencyException "
    + "handled and changes saved");
}

... but on EF 5.0 (RC), this doesn't seem to work because Refresh() doesn't exist on my EF5, code-first, DbContext derived context class.

I do see context.Entry(context.SalesOrderHeaders).Reload(); - but that appears to be a straightup reload-from-db and not a refresh/merge (with policy client wins).

Any ideas how to handle Optimistic concurrency exceptions in EF5? Actually even general pointers on exception handling in SaveChanges() would be nice

Thanks