将字符串列表绑定到组合框

我正在将List<String>绑定到组合框。我用两种方式写了这篇文章。第一种方式，ComboBox 的输出为空。我错在哪里？请帮助我。这是我的代码：

public class MaritalStatusComboBox:ComboBox
{
   public MaritalStatusComboBox()
    {       
        BindingSource bs = new BindingSource();
        bs.DataSource = new List<string> {"Single","Married" };
    }
}

和第二种方式：

public class MaritalStatusComboBox:ComboBox
{
    List<string> list = new List<string>() { "Single", "Married" };
    public MaritalStatusComboBox()
    {
        this.Items.Clear();
        foreach (string str in list)
        {
            this.Items.Add(str);
        }
    }
}

组合框的输出包括它：单已婚收集为什么收藏夹会出现在我的组合框中？

BindingSource bs = new BindingSource();
bs.DataSource = new List<string> { "Single", "Married" };
this.DataSource = bs;