How to pass data from Main Window to a User Control using MVVM in C#?

I have just started C# programming could you provide more details...example?

On my end, here is a little more detail:

Main Window XAML:
<UC:DeliveryControl UC1="{Binding Path=ContainerData, Mode=TwoWay}" />

User Control XAML (i.e. DeliveryControl):
<TextBox x:Name="tbxConDat" HorizontalAlignment="Left" Height="23" Margin="641,443,0,0" TextWrapping="Wrap" Text="{Binding UC1, ElementName=root}" VerticalAlignment="Top" Width="120" Focusable="False" IsEnabled="False" TextChanged="tbxConDat_TextChanged" RenderTransformOrigin="0.408,19.783" Visibility="Hidden"/>

User Control Code Behind:
<pre lang="cs">public static readonly DependencyProperty UC1Property = DependencyProperty.Register(&quot;UC1&quot;, typeof(string),

typeof(DeliveryControl), new PropertyMetadata((string)&quot;&quot;));



public string UC1

{

get { return (string)GetValue(UC1Property); }

set

{

SetValue(UC1Property, value);

}

}



public static readonly DependencyProperty UCESIProperty = DependencyProperty.Register(&quot;UCESI&quot;, typeof(string),

typeof(DeliveryControl), new PropertyMetadata((string)&quot;&quot;));</pre>


This all works fine except that I cannot access UC1 from the User Control (DeliveryControl) View Model.