How to set value of a textbox field in UserControlA from UserControlB

Question

Hi

I have a got a window that has UserControl A. This User Control A contains a TextBoxUCA field. I have got another UserControl, which is named as UserControlB.
I would need to set the value TextBoxUCA from UserControlB. How can I achieve that, so blur about dependency property, do I need to use dependency property or can I just create a property for the TextBoxUCA at UserControl A. Would appreciate anyone who can point me to the right direction.

Answer 1

Hi,
the easiest way to communicate between 2 UserControls is Binding to properties in the same instance of ViewModel, like this:

Main window with UserControls and DataContext (ViewModel instance)

<Window x:Class="Window046"  
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
        xmlns:local="clr-namespace:WpfApp1.WpfApp046"  
        mc:Ignorable="d"  
        Title="Window046" Height="450" Width="800">  
  <Window.DataContext>  
    <local:ViewModel/>  
  </Window.DataContext>  
  <StackPanel>  
    <local:Window046UC1 Height="100"/>  
    <local:Window046UC2 Height="100"/>  
  </StackPanel>  
</Window>  

First UserControl with TextBox:

Answer 2

I will show you a demo with C# code.
The Xaml code:

The cs code is:

The result is as below shown:

Answer 3

HI

Thank you for replying. Solved it