WPF ViewModelBase

<Window.DataContext>

        <local:Preview_model />

    </Window.DataContext>

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
 
namespace UDP_Client
{
    public abstract class ViewModelBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
 

         //SetValue(ref _labels, value);
        public void SetValue<T>(ref T property, T value, [CallerMemberName] string propertyName = null)
        {
            if (property != null)
            {
                if (property.Equals(value))
                {
                    return;
                }
            }
 
            property = value;
            OnPropertyChanged(propertyName);
        }
 
        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
 
        #region -- Debugging Aides --
        //protected virtual bool ThrowOnInvalidPropertyName { get; private set; }
 
        //[Conditional("DEBUG")]
        //[DebuggerStepThrough]
        //public void VerifyPropertyName(string propertyName)
        //{
        //    // Verify that the property name matches a real, public, instance property on this object. 
        //    if (TypeDescriptor.GetProperties(this)[propertyName] == null)
        //    {
        //        string msg = "Invalid property name: " + propertyName;
        //        if (this.ThrowOnInvalidPropertyName)
        //            throw new Exception(msg);
        //        else
        //            Debug.Fail(msg);
        //    }
        //}
        #endregion -- Debugging Aides --
    }
}