Base View Model (simple)

ViewModelBase.cs

using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace App1
{
    public class ViewModelBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected void SetValue<T>(ref T storage, T value, [CallerMemberName]string propertyName = null)
        {
            if (object.Equals(storage, value)) { return; }

            storage = value;
            RaisePropertyChanged(propertyName);
        }

        void RaisePropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }
}