WPF C#

      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    
        
        
    

    
        
        
        
        
    

               Margin="24 24 24 0"
           Content="Source TextBox Controls" />
               Margin="24 24 24 0"
           Content="Target TextBox Controls" />
                 Margin="24" />
                 Margin="24" 
             Text="{Binding ElementName=txtbox1, Path=Text, Mode=TwoWay}" />
                 Margin="24" />
                 Margin="24" 
             Text="{Binding ElementName=txtbox2, Path=Text, Mode=TwoWay}" />
                 Margin="24" />
                 Margin="24" 
             Text="{Binding ElementName=txtbox3, Path=Text, Mode=TwoWay}" />