Watermark textbox in wpf

This is a sample which demonstrates how to create a watermark textbox in WPF:

Create : WatermarkTextBox.cs

using System;
using System.Collections.Generic;
using System.Linq;
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.Navigation;
using System.Windows.Shapes;

namespace Controls
{
    public class WatermarkTextBox : TextBox
    {
        static WatermarkTextBox()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(WatermarkTextBox),
                new FrameworkPropertyMetadata(typeof(WatermarkTextBox)));
        }
        
        public object Watermark
        {
            get { return (object)GetValue(WatermarkProperty); }
            set { SetValue(WatermarkProperty, value); }
        }
        // Using a DependencyProperty as the backing store for Watermark.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty WatermarkProperty = DependencyProperty.Register(
            "Watermark", 
            typeof(object), 
            typeof(WatermarkTextBox), 
            new UIPropertyMetadata(null));
    }
}

Output

Download : Here