How can I set the Owner property of the WPF window to the handle of our main form?

We can do this by using WindowInteropHelper. This can be done with the following code snippets.

[C#]
var wpfWindow = new MainWindow();
            WindowInteropHelper windowInteropHelper = new WindowInteropHelper(wpfWindow);
            windowInteropHelper.Owner = this.Handle;
            wpfWindow.Show();

Note: While using the previous code in the form, add the following WPF assemblies to show the WPF window.

• PresentationCore
• PresentationFramework
• WindowsBase

Reference link: https://stackoverflow.com/questions/32701680/setting-a-form-as-owner-for-a-window