WPF C# Tutorial

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="TwoDocument" Height="300" Width="300">
  
    
  

  
    
      
      
    

    
      
        
        
        
        
        
        
      
    
    
      
        
      

      
    
  


//File:Window.xaml.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
namespace Commands
{
    public partial class TwoDocument : System.Windows.Window
    {
        Dictionary isDirty = new Dictionary();
        public TwoDocument()
        {
            InitializeComponent();
        }
        private void SaveCommand(object sender, ExecutedRoutedEventArgs e)
        {            
            string text = ((TextBox)sender).Text;
            isDirty[sender] = false;
        }
        private void txt_TextChanged(object sender, RoutedEventArgs e)
        {
            isDirty[sender] = true;
        }
        private void SaveCommand_CanExecute(object sender, CanExecuteRoutedEventArgs e)
        {
            if (isDirty.ContainsKey(sender) && isDirty[sender] == true)
            {
                e.CanExecute = true;
            }
            else
            {
                e.CanExecute = false;
            }             
        }
    }
}