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(WinUI does still have Binding though.) If so, the ViewModelExtensions class passes the new Parameter . It's defined on the FrameworkElement class, which most UI controls, including the WPF Window, inherits from. When they are both at the project namespace, the view runs without exceptions with binding statements along the lines of: where PrefixFilterChoices is a property on the VM. wpf - UserControl's DataContext - Stack Overflow Call User Controls In Main Window Using WPF My favorite way of wiring up design-time data to a WPF view (before switching to .NET 5.0, at least) was through the the use of the d:DesignData markup extension, used in conjunction with the d:DataContext attached property.. c# - WPF: ItemsControl and DataContext - Stack Overflow Have anyone a small sample how i can send an get data from the UserControl Window? Common DataBinding Properties. C# WPF user Control Binding Problem. All the descendants of FrameworkElement can utilize the DataContext . How to add Custom Properties to WPF User Control. Set the View's DataContext to your View Model. Both TextBoxes are bound to the same DataContext as the rest of the page, and then the Text property is two way bound to the FirstName and LastName properties of the . How to know when the DataContext changed in your control but something is going wrong. This overview also introduces specialized aspects of dependency properties, such as . Select a file using the browse button and see the name of the file appear in the TextBox control. More › Each of the binding on the ComboBox have the UserControl's name as the ElementName. Best regards. However, this doesn't work. So i made a little project to understand that. Every control in WPF has a data context, the control can access properties from your data context. WPF XAML namespace refactoring - STACKOOM A simple comment as Josh suggests will go a long way, but the downside is that comments create a maintainability issue.