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如何在 C# ASP.NET 中从 gridview 的页脚行中查找文本框的值

我想在 C# ASP .NET 中获取 Gridview 页脚行的文本框的值，但文本框的返回值为 null 或空。

<asp:GridView ID="GridView1" runat="server" Width="1214px"       
        AutoGenerateColumns="False" ShowFooter="true" 
        OnRowDataBound="GridView1_RowDataBound" OnRowCommand="GridView1_RowCommand">
        <Columns>
        <asp:TemplateField HeaderText="Update">
            <ItemTemplate>
                <asp:LinkButton ID="lbtn_Update" runat="server" Text="Update"/>
                <asp:LinkButton ID="lbtn_Delete" runat="server" Text="Delete"/>
            </ItemTemplate>
            <FooterTemplate>
               <asp:LinkButton ID="lbtn_Delete" runat="server"CommandArgument="AddNew" Text="Insert"/>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Student ID">
            <EditItemTemplate>
                <asp:Label ID="lblEditSID" runat="server" Text='<%#Eval("sid")%>' />
            </EditItemTemplate>
            <ItemTemplate>
                <asp:Label ID="lblSID" runat="server" Text='<%#Eval("sid")%>' />
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtSID" runat="server" MaxLength="50"/>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Student Name">
            <EditItemTemplate>
               <asp:Label ID="lblEditSName" runat="server" Text='<%#Eval("sname")%>'/>
            </EditItemTemplate>
            <ItemTemplate>
                <asp:Label ID="lblSName" runat="server" Text='<%#Eval("sname")%>' />
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtSName" runat="server"/>
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Student Mobile No">
            <EditItemTemplate>
               <asp:TextBox ID="txtEditMobile" runat="server" Text='<%#Eval("smno")%>'/>                 
            </EditItemTemplate>
            <ItemTemplate>
                <asp:Label ID="lblMobile" runat="server" Text='<%#Eval("smno")%>' />
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtMobile" runat="server" />
            </FooterTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Student Email-ID">
            <EditItemTemplate>
          <asp:TextBox ID="txtEditEmail" runat="server" Text='<%#Eval("mailid")%>'/> 
            </EditItemTemplate>
            <ItemTemplate>
                <asp:Label ID="lblEmail" runat="server" Text='<%#Eval("mailid")%>' />
            </ItemTemplate>
            <FooterTemplate>
                <asp:TextBox ID="txtEmail" runat="server" />
            </FooterTemplate>
            </asp:TemplateField>       
        </Columns>
    </asp:GridView>

这是后面的代码代码，我想在 C# ASP .NET 中获取 Gridview 页脚行的 Textbox 的值，但 textboxs 的 reurn 值为 null 或空

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e) {
    if (e.CommandArgument.Equals("AddNew")) {
        GridView test=(GridView)sender;
        TextBox txtSid = (TextBox)(test.FooterRow.FindControl("txtSID"));
        TextBox txtName = (TextBox)(GridView1.FooterRow.FindControl("txtSName"));
        TextBox txtMobile = (TextBox)(GridView1.FooterRow.FindControl("txtMobile"));
        TextBox txtEmail = ((TextBox)GridView1.FooterRow.FindControl("txtEmail"));            
        string strSid =txtSid.Text;
        string strName = txtName.Text;
        string strMobile = txtMobile.Text;
        string strEmail = txtEmail.Text;
     }
}

Textxtbox 值是null或空字符串，strName当我将值输入文本框时，其他字符串为空。

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