C# grid binding not update

public string Name
{
  get
  {
    return this._Name;
  }
  set
  {
    if (value != this._Name)
    {
        this._Name= value;
        NotifyPropertyChanged("Name");
    }
  }
}

public event EventHandler NameChanged;


public string Name
{
  get
  {
    return this._Name;
  }
  set
  {
    if (value != this._Name)
    {
        this._Name= value;
        if (NameChanged != null) NameChanged(this, EventArgs.Empty);
    }
  }
}