Remotely/Desktop.Core/ViewModels/ViewModelBase.cs

using System.ComponentModel;

namespace Remotely.Desktop.Core.ViewModels
{
    public class ViewModelBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        public void FirePropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}