gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Input;

namespace HumanResourcesLib
{
    class DelegateCommand : ICommand
    {
        public Action Do { get; set; }
        public Func<bool> CanDo { get; set; }

        public void ChangeCanDo()
        {
            if (CanExecuteChanged != null)
                CanExecuteChanged(this, new EventArgs());

        }

        public bool CanExecute(object parameter) 
        {
            if (CanDo != null)
            {
                return CanDo();
            }
            return false;
        }

        public event EventHandler CanExecuteChanged;

        public void Execute(object parameter)
        {
            if (Do != null)
                Do();
        }
    }
}