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One way and two way binding

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:src="clr-namespace:MyNameSpace.CustomElementBinding"          Title="Custom Element Binding Demo">     <StackPanel>     <ScrollBar Name="scroll"                Orientation="Horizontal"                Margin="24"                 Maximum="100"                LargeChange="10"                SmallChange="1"                 Value="{Binding ElementName=simple, Path=Number,Mode=TwoWay}" />     <src:SimpleElement Number="{Binding ElementName=scroll,Path=Value,Mode=OneWay}"/>     </StackPanel> </Window> //File:Window.xaml.cs using System; using System.Globalization; using System.Windows; using System.Windows.Media; namespace MyNameSpace.CustomElementBinding {     class SimpleElement : FrameworkElement     {         public static DependencyProperty NumberProperty;         static SimpleElement()         {             NumberProperty = DependencyProperty.Register("Number", typeof(double),typeof(SimpleElement),                     new FrameworkPropertyMetadata(0.0,FrameworkPropertyMetadataOptions.AffectsRender));         }         public double Number         {             set { SetValue(NumberProperty, value); }             get { return (double)GetValue(NumberProperty); }         }         protected override Size MeasureOverride(Size sizeAvailable)         {             return new Size(200, 250);         }         protected override void OnRender(DrawingContext dc)             {             dc.DrawText(new FormattedText(Number.ToString(),                          CultureInfo.CurrentCulture, FlowDirection.LeftToRight,                         new Typeface("Times New Roman"), 12,                          SystemColors.WindowTextBrush),new Point(0, 0));          }     } }