Binding | WPF Tutorial pdf

Binding is the most important and complex Markup extension which might be used to bind one object. It provides Databound object when the data object is assigned to the DataContext of the object.
Thus say you have an object Obj which has several properties like Name, Age etc.
Then you might write
Text = "{Binding Name}"
which means the Data Context object will automatically be evaluated during runtime and the actual value of Name property of the object will be shown on the Text property.
Binding has lots of flexibilities, thus you can specify expressions on the data bound objects and hence made it one of the most complex Markup extension.

<StackPanel Orientation="Vertical">
<TextBox x:Name="txtObj"></TextBox>
<TextBox x:Name="txtCustom" Text="{Binding FallbackValue=10,
ElementName=txtObj, Path=Text,StringFormat='Text Entered : {0:N2}'},
Mode=TwoWay">
</TextBox>
</StackPanel>
As both of them are bound any change to the property automatically reflects the changes to the other textbox. There are few modes of these binding, OneTime, OneWayToSource, OneWay and TwoWay. StringFormat creates formatting of the string. We can have Converters associated with a binding to enable us to return appropriate value based on the value we feed in.
You can read how to create Converter for Binding from :
How to deal with Converter in Binding
In case of binding, you must also make sure that the object which is bound to have implemented INotifyPropertyChanged. Otherwise every binding will work as OneTime.
You can read more on how you can implement Binding with INotifyPropertyChanged from :
Change Notification for objects and Collection We will discuss Binding in greater detail in next article.