partnership

A, B and C, constitute a partnership firm for running a restaurant. The deed of partnership stipulates that no partner would independently carry on competitive business, even after retiring from partnership for a period of two years in the neighbour. C is expelled from the partnership on the grounds of not contributing for share towards the capital of the firm. C, opened a restaurant in the neighborhood. Can he be restrained by a suit brought by A and B? Will it make any difference, if the firm was not registered?