docs-desktop/dotnet-desktop-guide/net/wpf/properties/snippets/custom-dependency-properties/csharp/App.xaml.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;

namespace CodeSampleCsharp
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
    }
}