public class WebForm1 : System.Web.UI.Page
    {
        private string ee;
        protected void Page_Load(object sender,EventArgs e)
        {}
            public string abc(string aa,int bb)
        {
                string cc="aaaaa"+aa;
            string dd="bbbbb"+bb;
            this.ee=cc+dd;
            if(bb<=25)
            {
                ee+="yyyyy";
            }
            else if(bb>25&&bb<45)
            {
                    ee+="ttttt";
            }
            else 
                ee+="ooooo";
        }}
//编译显示如下
“WebApplication003asp.WebForm1.abc(string, int)” : 并非所有的代码路径都返回值
请各位看看！先行谢谢！