public void RemoveUserFromRole(string userName, string roleName)
{
userName = userName.ToLower();
Query q = UserRole.CreateQuery();
q.AndWhere(UserRole.Columns.UserId, (GraffitiUsers.GetUser(userName) as User).Id);
q.AndWhere(UserRole.Columns.RoleName, roleName);
UserRoleCollection urCol = new UserRoleCollection();
urCol.LoadAndCloseReader(q.ExecuteReader());
if (urCol.Count > 0)
{
UserRole.Destroy(urCol[0].Id);
}
}