Check if an User is a member of certain group

Use the following method which says whether an user is a member of sharepoint group

public bool isGroupMember(SPItemEventProperties properties)
        {
            bool isMember = false;
            SPWeb web = properties.Web;
            isMember = web.IsCurrentUserMemberOfGroup(web.Groups["MySite Owners"].ID);
            web.Close();
            return isMember;
        }