Specify a Default Value for a Binding

      
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     Title="WPF" Height="120" Width="300">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="60"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <Grid.RowDefinitions>
            <RowDefinition Height="28"/>
            <RowDefinition Height="28"/>
            <RowDefinition Height="28"/>
        </Grid.RowDefinitions>

        <TextBlock Margin="4" Text="First Name" VerticalAlignment="Center"/>
        <TextBox Margin="4" Text="{Binding Path=FirstName, FallbackValue=First name goes here}"
                 FontStyle="Italic" Grid.Column="1"/>
        
        <TextBlock Margin="4" Text="Last Name" Grid.Row="1" VerticalAlignment="Center"/>
        <TextBox Margin="4" Text="{Binding Path=LastName, FallbackValue=Second name goes here}"
                 FontStyle="Italic" Grid.Column="1" Grid.Row="1"/>
        
        <TextBlock Margin="4" Text="Age" Grid.Row="2" VerticalAlignment="Center"/>
        <TextBox Margin="4" Text="{Binding Path=Age, FallbackValue=Age goes here}"
                 FontStyle="Italic" Grid.Column="1" Grid.Row="2"/>
    </Grid>
</Window>

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Specify a Default Value for a Binding : Binding « Windows Presentation Foundation « VB.Net

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