How to bind multiple TextBoxes on one label

Question

For my exercise:

I have to concat the values of two input fields (string), in order to show them - through a binding object - in a Label

Here the XAML Code:

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<Grid>
<TextBox x:Name="txtFirstName" HorizontalAlignment="Left" Height="45" Margin="35,84,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="144"
Text="{Binding ConcatFullName, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}"/>
<TextBox x:Name="txtLastName" HorizontalAlignment="Left" Height="45" Margin="210,84,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="144"
Text="{Binding ConcatFullName, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}"/>
<Label x:Name="lblConcat" Content="Name Verkettung" HorizontalAlignment="Left" Margin="403,53,0,0" VerticalAlignment="Top" FontSize="16" FontFamily="Segoe UI Black"/>
<Label x:Name="lblConcatTheFullName" HorizontalAlignment="Left" Margin="403,84,0,0" VerticalAlignment="Top" Width="144"
Foreground="#FF002DFF" FontSize="14" Height="45" Content="{Binding ConcatFullName}"/>
</Grid>

INotifyPropertyChanged with Method FullName

public class FullName : INotifyPropertyChanged
{
private string _ConcatFullName;
public string ConcatFullName
{
get { return _ConcatFullName; }
set
{
if(_ConcatFullName != value)
{
_ConcatFullName = value;
INotifyPropertyChanged("ConcatFullName");
}
}
}

File XAML.cs

//Here I implement a method to show on the UI the concat of two strings in a label

public MainWindow()
{
InitializeComponent();
this.DataContext = txtFirstName;
this.DataContext = txtLastName;
lblConcatTheFullName.DataContext = FullName();
}
private string FullName()
{
return this.txtFirstName + " " + this.txtLastName;
}

Unfortunately I don't get the desired result. What is wrong with the data Binding?

Is there any other confortable way to solve this problem?

Any help please?

Many thanks in advance.

Best regards

Johannes

Rajanikant Hawaldar · Answer

HI only this code is enough, Grid > TextBox x:Name = "PersonName" HorizontalAlignment = "Left" Height = "23" Margin = "65,52,0,0" TextWrapping = "Wrap" Text = "Name" VerticalAlignment = "Top" Width = "280" /> TextBox x:Name = "PersonLevel" HorizontalAlignment = "Left" Height = "23" Margin = "10,105,0,0" TextWrapping = "Wrap" Text = "Level" VerticalAlignment = "Top" Width = "280" /> TextBlock > TextBlock.Inlines > Run Text = "{Binding Text, ElementName=PersonName}" /> Run Text = "{Binding Text, ElementName=PersonLevel}" /> TextBlock.Inlines > TextBlock > Grid > https://stackoverflow.com/questions/48804124/wpf-c-bind-content-from-two-textboxes-to-a-single-label

Giovanbattista Barra · Answer

Hi Rajanikant, thanks for your reply. But this is hard coded. And your example is for readonly. I understand how you made it but unfortunately this is not the goal of my exercise. I need to fill manually the two textboxes and the content of them must be shown on the label. If I put away Name and Level from Text="Name" and Text="Level" in (Text=" " and Text=" ") because I would like to fill the input fields manually (write in the textboxes), but it doesent work. It's very weird because Textboxes are input fields. Any Idea?