how can I check if a user (not the one currently logged in) is member of a certain group? Trying to retrieve a user from a group of which he's not a member leads to an SPException, so checking for null is not possible.
So how would you solve this problem. At the moment I think about searching in the SPGroup.Users.XML string for the user's name or iterating over all the group members and checking the login names.
I forgot to mention that I want to avoid the usage of exception handling to check the user's membership.