Use custom fields for search

In my code I am using Fieldfilter to search a list like the following and I want to know how to assign the the member value to search for results with member value of both 0 and 1

FieldFilter memberFilter = new FieldFilter();

memberFilter.FieldName = "profile_IsMember";

memberFilter.FieldValue = member;

options.FieldFilters.Add(memberFilter);

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