WPF C# Tutorial

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="ModernWindow" Height="300" Width="300"
        AllowsTransparency="True" Background="Transparent"
        WindowStyle="None" ResizeMode="CanResizeWithGrip">
             BorderBrush="#395984"
          BorderThickness="1"
          CornerRadius="0,20,30,40" >
    
      
        
          
            
            
  
          

        

      
    

    
      
      Close
                       MouseLeftButtonDown="window_initiateWiden"
                 MouseLeftButtonUp="window_endWiden"
                 MouseMove="window_Widen"/>
      

    
  

//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 Windows
{
    public partial class ModernWindow : System.Windows.Window
    {
        public ModernWindow()
        {
            InitializeComponent();
        }
        bool isWiden = false;
        private void window_initiateWiden(object sender, System.Windows.Input.MouseEventArgs e)
        {
            isWiden = true;
        }
        private void window_endWiden(object sender, System.Windows.Input.MouseEventArgs e)
        {
            isWiden = false;
            Rectangle rect = (Rectangle)sender;
            rect.ReleaseMouseCapture();
        }
        private void window_Widen(object sender, System.Windows.Input.MouseEventArgs e)
        {
            Rectangle rect = (Rectangle)sender;
            if (isWiden)
            {                
                rect.CaptureMouse();
                double newWidth = e.GetPosition(this).X + 5;
                if (newWidth > 0) this.Width = newWidth;
            }            
        }
        private void titleBar_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            this.DragMove();
        }
        private void cmdClose_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }
    }
}