radiobuttonlist 默认选中第一个

开始语句是这样：
RadioButtonList theRadio;
theRadio = (RadioButtonList)FormView3.FindControl("RadioButtonList1");
String SelWP = theRadio.SelectedValue.ToString();
现在我想要SelWp字符串直接默认接收radiobuttonlist的第一个选项应该怎么改啊？求高人解答。

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RadioButtonList theRadio;
theRadio = (RadioButtonList)FormView3.FindControl("RadioButtonList1");
String SelWP = theRadio.Items[0].ToString();
/闭返蔽/世亩接受值的方轿州式为:
String SelWP = theRadio.Items[0].Value;

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