How to fix Binding TextBlock in WPF MVVM? - wpf

Question

You see my XAML code at the bottom; when I debug it in the runtime, I see nothing in two TextBlocks of the StackPanel of my window, whereas there is some data in the binding TextBlocks when it is running!
Why can I see nothing in those TextBlocks?
<Grid Name="SchoolGridView"
AutomationProperties.AutomationId="SchoolGridView"
AutomationProperties.Name="School Group" >
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<ListView Grid.Row="0" Height="Auto" x:Name="List"
HorizontalContentAlignment="Center" ItemsSource="{Binding
PeopleList}" SelectionMode="Single">
...
</ListView>
<StackPanel Background="LightGray" Height="60"
Orientation="Horizontal" VerticalAlignment="Bottom" Grid.Row="1"
Visibility="{Binding
IsDetailVisible,UpdateSourceTrigger=PropertyChanged}">
<StackPanel HorizontalAlignment="Left" Width="320">
<TextBlock Height="20" Text="asaasdasd"></TextBlock>
<TextBlock Height="20" HorizontalAlignment="Left"
Background="Yellow" Text="{Binding DataContext.FullName,
UpdateSourceTrigger=PropertyChanged}"/>
<TextBlock Height="20" HorizontalAlignment="Left"
Background="Yellow" Text="{Binding
DataContext.RowSelectedItem,
UpdateSourceTrigger=PropertyChanged}"/>
</StackPanel>
<WrapPanel HorizontalAlignment="Right">
<Button Content="DELETE" HorizontalAlignment="Right"
VerticalAlignment="Top"
Width="auto" Height="50" Margin="3" Command="
{Binding DataContext.DeleteCommand, ElementName=List}"
CommandParameter="{Binding SelectedItem,
ElementName=List}"/>
</WrapPanel>
</StackPanel>
</Grid>
</Window>

Answer 1

You must fill DataContext
<Window x:Class="SampleApplication.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:SampleApplication"
Title="MainWindow" Height="350" Width="525">
Or set it in Code
DataContext = new ViewModel();