WPF 绑定 验证

<TextBox Grid.Column="1"
Margin="1"
Text="{Binding Name,
ValidatesOnExceptions=True,
UpdateSourceTrigger=PropertyChanged}" />
在属性setter方法中校验时出现错误，就会出现一个红色的错误框。
private string name;
public string Name
{
get { return this.name; }
set
{
if (string.IsNullOrWhiteSpace(value))
{
throw new ArgumentException("Name cannot be empty!");
}

if (value.Length < 4)
{
throw new ArgumentException("Name must have more than 4 char!");
}
this.name = value;
this.OnPropertyChanged(() => this.Name);
}
}