怎样按字母顺序（ABCDEF）动态添加控件

考试系统中题库设计时，我想动态添加选项，顺序按ABCDEF这样，点击一下按钮添加A（radiobutton），再点击添加B，如此依次添加。本人比较菜，求达人写一个方法。

private void button1_Click(object sender, EventArgs e)
{
     string[] radioButtonList = new string[] { "A", "B", "C", "D", "E", "F", "G" };

     for (int i = ; i < radioButtonList.Length; i++)
     {
          if (this.Controls[radioButtonList[i]] == null)
          {
               RadioButton radioButton = new RadioButton();
               radioButton.Name = radioButtonList[i];
               radioButton.Text = radioButtonList[i];
               radioButton.Width = ;
               radioButton.Location = new Point(,  + i * );
               this.Controls.Add(radioButton);
               break;
          }
      }
}

换一下方法，横向加radiobutton。

private void button1_Click(object sender, EventArgs e)
{
     string[] radioButtonList = new string[] { "A", "B", "C", "D", "E", "F", "G" };

     for (int i = ; i < radioButtonList.Length; i++)
     {
          if (this.Controls[radioButtonList[i]] == null)
          {
               RadioButton radioButton = new RadioButton();
               radioButton.Name = radioButtonList[i];
               radioButton.Text = radioButtonList[i];
               radioButton.Width = ;
               radioButton.Location = new Point( + i * , );
               this.Controls.Add(radioButton);
               break;
           }
       }
}