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我需要解释我的问题...当我单击弹出模式中的保存按钮时，“弹出模式中的文本框总是返回空”。我需要获取 txtCityName.Text 和 txtCityDescription.Text 的值；

here's my code... 
======================
THE HTML
=======================
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="modal.aspx.cs" Inherits="sample.modal" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div id="DivModifyCity" runat="server" class="modal" style="overflow: hidden; margin-top: 50px; display: none">
            <div class="modal-header">
                <div style="display: inline-block;" class="pull-right ">
                    <asp:LinkButton ID="lnkCloseCity" runat="server" CssClass="icon-remove" ToolTip="Close" data-dismiss="modal" aria-hidden="true" type="button" value="Close" Height="20px"></asp:LinkButton>
                </div>
                <h3>
                    <asp:Label ID="lblCityStatus" runat="server" Text="Add City"></asp:Label></h3>
            </div>
            <div class="modal-body">
                <table cellpadding="0" cellspacing="0" style="width: 100%">
                    <tr>
                        <td>&nbsp;</td>
                        <td class="input-medium" style="width: 140px">&nbsp;</td>
                        <td>&nbsp;</td>
                        <td>&nbsp;</td>
                    </tr>
                    <tr>
                        <td>&nbsp;</td>
                        <td class="input-medium" style="width: 140px">
                            <asp:Label ID="Label8" runat="server" Text="City Name" Font-Size="12pt"></asp:Label></td>
                        <td>
                            <asp:TextBox ID="txtCityName" type="text" placeholder="City Name" runat="server" MaxLength="150"></asp:TextBox></td>
                        <td>&nbsp;</td>
                    </tr>
                    <tr>
                        <td>&nbsp;</td>
                        <td class="input-medium" style="width: 140px">&nbsp;</td>
                        <td>&nbsp;</td>
                        <td>&nbsp;</td>
                    </tr>
                    <tr>
                        <td>&nbsp;</td>
                        <td class="input-medium" style="width: 140px">
                            <asp:Label ID="Label9" runat="server" Text="City Description" Font-Size="12pt"></asp:Label></td>
                        <td>
                            <asp:TextBox ID="txtCityDescription" type="text" runat="server" placeholder="Description" Height="50px" TextMode="MultiLine"></asp:TextBox></td>
                        <td>&nbsp;</td>
                    </tr>
                </table>

            </div>
            <div class="modal-footer">
                <asp:LinkButton ID="lnkSaveCity" runat="server" Font-Underline="false" Font-Bold="true" Text="Save" CssClass="btn btn-primary" Height="20px" ToolTip="Add new city" OnClick="btnSaveCity_Click"></asp:LinkButton>
            </div>
        </div>

        <a data-toggle="modal" href="#DivModifyCity" class="btn btn-primary btn-lg">Launch demo modal</a>
    </form>

    <%--    modal popup--%>
    <link href="bootstrap/css/bootstrap.css" rel="stylesheet" />
     <script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
    <link href="../Scripts/css/bootstrap.css" rel="stylesheet" />
    <script src="../Scripts/js/bootstrap-modal.js"></script>

    <%-- end here--%>
</body>
</html>

=========================
server side code:
=========================
 protected void btnSaveCity_Click(object sender, EventArgs e)
        {
            string try1 = txtCityName.Text;
            string try2 = txtCityDescription.Text;
        }
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