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 *     following disclaimer. 
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using XenAdmin.Network;
using XenAdmin.Core;
using XenAPI;
using XenAdmin.Dialogs;
using System.Collections.ObjectModel;
using System.Windows.Forms;


namespace XenAdmin.Commands
{
    /// <summary>
    /// Deconfigures Workload Balancing for the selected Pool.
    /// </summary>
    internal class DisconnectWlbServerCommand : Command
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        /// <summary>
        /// Initializes a new instance of this Command. The parameter-less constructor is required if 
        /// this Command is to be attached to a ToolStrip menu item or button. It should not be used in any other scenario.
        /// </summary>
        public DisconnectWlbServerCommand()
        {
        }

        protected override void ExecuteCore(SelectedItemCollection selection)
        {
            if (Helpers.FeatureForbidden(selection[0].XenObject, Host.RestrictWLB))
            {
                // Show upsell dialog
                UpsellDialog dlg = new UpsellDialog(Messages.UPSELL_BLURB_WLB, InvisibleMessages.UPSELL_LEARNMOREURL_WLB);
                dlg.ShowDialog(Parent);
                return;
            }

                try
                {
                    Dialogs.Wlb.DisableWLBDialog disableDialog = new XenAdmin.Dialogs.Wlb.DisableWLBDialog(string.Empty);
                    DialogResult dr = disableDialog.ShowDialog(MainWindow.ActiveForm);

                    if (dr == DialogResult.OK)
                    {
                        Actions.Wlb.DisableWLBAction action = new Actions.Wlb.DisableWLBAction(selection[0].PoolAncestor, true);
                        action.Completed += Program.MainWindow.action_Completed;
                        action.RunAsync();
                        Program.MainWindow.UpdateToolbars();
                    }
                }
                catch (Failure exn)
                {
                    log.Error(exn, exn);
                }
       }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            //Clearwater doesn't has WLB
            if (selection.Any(s => Helpers.IsClearwater(s.Connection)))
                return false;

            if (selection.Count == 1)
            {
                IXenConnection connection = selection[0].Connection;
                Pool pool = selection[0].PoolAncestor;
                bool inPool = pool != null;

                return inPool  && (Helpers.WlbConfigured(pool.Connection) && !Helpers.FeatureForbidden(connection, Host.RestrictWLB));
            }
            return false;
        }
    }
}