怎么解决： 控制离开当前方法之前必须对 out 参数“choice”赋值 ?

在所有的else if后再加一个else selected = new TextBox; choice = 0;

   else if (radioButton3.Checked)
            { selected = textBox3; choice = 3; }
请问是在哪里添加，怎么添加都会报错

   else if (radioButton3.Checked)
            { selected = textBox3; choice = 3; }

else {selected = new TextBox; choice = 0;}

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