Asp.net C＃：在GridView中添加新行

Question

我正尝试在按下按钮时在GridView中创建一个新行，其值为labels：

<Asp:Label id="Label1" runat="Server" Text="My name">
<Asp:Label id="Label2" runat="Server" Text="My Age">
<Asp:Label id="Label3" runat="Server" Text="My Gender">

以下GridView包含Label TemplateFields

    <Asp:Gridview runat="Server" Id="GridView1" AutoGenerateColumns="False">   
    <Columns>   

      <asp:TemplateField HeaderText="Name">
       <ItemTemplate>
        <asp:Label runat="server" ID="Name_lbl" Text='<%# Eval("Name")%>'></asp:Label>
      </ItemTemplate>
     </asp:TemplateField>   

     <asp:TemplateField HeaderText="Age">
       <ItemTemplate>
        <asp:Label runat="server" ID="Age_lbl" Text='<%# Eval("Age")%>'></asp:Label>
      </ItemTemplate>
     </asp:TemplateField> 

    <asp:TemplateField HeaderText="Gender">
       <ItemTemplate>
        <asp:Label runat="server" ID="Gender_lbl" Text='<%# Eval("Gender")%>'></asp:Label>
      </ItemTemplate>
     </asp:TemplateField> 

 </Columns>
</asp:GridView> 

在Button_Click中，Label值将插入到gridview中。

我的尝试将Label值插入GridView但我收到错误："DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'Name'"

      DataTable dt = new DataTable();
        DataRow dr;

        if (dt.Columns.Count == 0)
        {
            dt.Columns.Add("Name", typeof(string));
            dt.Columns.Add("Age", typeof(string));
            dt.Columns.Add("Gender", typeof(string));
        }

        foreach (GridViewRow gvr in GridView1.Rows)
        {
            dr = dt.NewRow();

            Label1.Text =( gvr.FindControl("Name_lbl") as Label).ToString();
            Label2.Text = (gvr.FindControl("Age_lbl") as Label).ToString();
            Label3.Text = (gvr.FindControl("Gender_lbl") as Label).ToString();

            dr[1] =  Label1.Text;
            dr[2] =  Label2.Text;
            dr[3] =  Label3.Text;


            dt.Rows.Add(dr); 
        }
        dr = dt.NewRow(); 
        dt.Rows.Add(dr);

        GridView1.DataSource = dt; 
        GridView1.DataBind();