It is possible to use WinForms and WPF in same project. A WinForm project can be modified so that WPF windows and other WPF elements can be added. For this you have to add WPF project GUID to the WinForms project’s manifest file.
Open project manifest file (one with the .csproj extension) and modify PropertyGroup node (the one without Condition element) as below:
<PropertyGroup>
<ProjectTypeGuids>
{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}
</ProjectTypeGuids>
</PropertyGroup>
After this modification restart VS. Now you can add WPF window or other WPF elements. You may also have to add references System.Xaml, PresentationCore and PresentationFramework.
For more please check: https://www.codeproject.com/Reference/720512/List-of-Visual-Studio-Project-Type-GUIDs and http://www.mobilemotion.eu/?p=1537