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    c# 检测到无法访问的代码 (CS0162) 怎么处理

    void Button1Click(object sender, EventArgs e)         {             double d=0;             string b=textBox2.Text.ToString();             double a=double.Parse(textBox1.Text);             double c=double.Parse(textBox3.Text);             if("b"=="+")                 d=a+c;             else if("b"=="-")                 d=a-c;             else if("b"=="*")                 d=a*c;             else if("b"=="/")                 d=a/c;             else             MessageBox.Show("亲,超出我的能力范畴了哦!","这是一个弱弱的的警告yeah~!");             textBox4.Text=d.ToString();

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    ASP.NET中通过GRIDVIEW"选择"的按钮将数据显示到TEXTBOX中

    <asp:GridView   ID="GridView1" runat="server" DataKeyNames="ckdh" Height="183px" Style="left: 0px; position: relative;             top: -18px; font-size: small;" Width="864px" AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False" DataSourceID="SqlDataSource1"              AutoGenerateSelectButton="True" CellPadding="4" ForeColor="#333333" GridLines="None"  OnSelectedIndexChanging="GridView1_SelectedIndexChanging" EmptyDataText="未录入">             <PagerStyle HorizontalAlign="Right" BackColor="#FFCC66" ForeColor="#333333"/>             <PagerSettings Mode="NextPreviousFirstLast" FirstPageText="第一页" PreviousPageText="上一页" NextPageText="下一页" LastPageText="最后一页" />             <Columns>                 <asp:BoundField  DataField="ckdh" HeaderText="出库单号" SortExpression="ckdh" />                 <asp:BoundField  DataField="ckkb" HeaderText="出库库别" SortExpression="ckkb" />                 <asp:BoundField  DataField="ypqx" HeaderText="药品去向" SortExpression="ypqx" />                 <asp:BoundField  DataField="ypbh" HeaderText="药品编号" SortExpression="ypbh" />                 <asp:BoundField  DataField="ypmc" HeaderText="药品名称" SortExpression="ypmc" />                 <asp:BoundField  DataField="gg" HeaderText="药品规格" SortExpression="gg" />                 <asp:BoundField  DataField="dw" HeaderText="药品单位" SortExpression="dw" />                 <asp:BoundField  DataField="sj" HeaderText="出库价格" SortExpression="sj" />                 <asp:BoundField  DataField="sl" HeaderText="出库数量" SortExpression="sl" />             </Columns>             <SelectedRowStyle ForeColor="Navy" BackColor="#FFCC66" Font-Bold="True" />             <RowStyle ForeColor="#333333" BackColor="#FFFBD6" />             <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />             <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />             <AlternatingRowStyle BackColor="White" />         </asp:GridView>

    01
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