/// <summary>
    /// Store selected (unselected) memberships.
    /// </summary>
    private void SaveData()
    {
        bool saved = false;

        // Check permission for manage membership
        if (!CMSContext.CurrentUser.IsAuthorizedPerResource("CMS.Membership", "Modify"))
        {
            RedirectToAccessDenied("CMS.Membership", "Modify");
        }

        this.lblInfo.Visible = false;

        // Remove old items
        string newValues = ValidationHelper.GetString(usMemberships.Value, null);
        string items     = DataHelper.GetNewItemsInList(newValues, currentValues);

        if (!String.IsNullOrEmpty(items))
        {
            string[] newItems = items.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
            if (newItems != null)
            {
                foreach (string item in newItems)
                {
                    int membershipID = ValidationHelper.GetInteger(item, 0);
                    MembershipRoleInfoProvider.RemoveMembershipFromRole(membershipID, RoleID);
                    MembershipInfoProvider.InvalidateMembershipUsers(membershipID);

                    saved = true;
                }
            }
        }

        // Add new items
        items = DataHelper.GetNewItemsInList(currentValues, newValues);
        if (!String.IsNullOrEmpty(items))
        {
            string[] newItems = items.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
            if (newItems != null)
            {
                // Add all new items to membership
                foreach (string item in newItems)
                {
                    int membershipID = ValidationHelper.GetInteger(item, 0);
                    MembershipRoleInfoProvider.AddMembershipToRole(membershipID, RoleID);
                    MembershipInfoProvider.InvalidateMembershipUsers(membershipID);

                    saved = true;
                }
            }
        }

        if (saved)
        {
            usMemberships.Reload(true);
            lblInfo.Visible = true;
        }
    }
    /// <summary>
    /// Adds membership to role. Called when the "Add membership to role" button is pressed.
    /// </summary>
    private bool AddMembershipToRole()
    {
        // Get role and user objects
        RoleInfo       role       = RoleInfoProvider.GetRoleInfo("MyNewRole", CMSContext.CurrentSiteID);
        MembershipInfo membership = MembershipInfoProvider.GetMembershipInfo("MyNewMembership", CMSContext.CurrentSiteName);

        if ((role != null) && (membership != null))
        {
            MembershipRoleInfoProvider.AddMembershipToRole(membership.MembershipID, role.RoleID);

            return(true);
        }

        return(false);
    }