ASP.NET2.0中创建模态对话框提交按钮不起作用，什么原因？

 

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Data.SqlClient;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Admin_Links_AddEditLinks : System.Web.UI.Page
...{
    DBUtility.TSqlDB Db = new DBUtility.TSqlDB();
    JSModel.TJavaScript JS = new JSModel.TJavaScript();
    FileModel.UpLoadFile upFile = new FileModel.UpLoadFile();

    protected void Page_Load(object sender, EventArgs e)
    ...{
        Response.Expires = 0;
        Response.Cache.SetNoStore();
        Response.AppendHeader("Pragma", "no-cache");

        new CheckUser();
        if (Request["LId"] != null)
        ...{
            SqlDataReader Dr = Db.ExecuteReader(Db.myCon, CommandType.Text, "select * from tb_HyperLink where dc_Id="+Request["LId"], null);
            if (Dr.Read())
            ...{
                txtLinkName.Text = Dr["vc_LinkName"].ToString();
                txtLinkUrl.Text = Dr["vc_LinkUrl"].ToString();
                HWhere.Value = Dr["vc_LogoUrl"].ToString();
            }
            Dr.Close();
        }
    }

    protected void btnAdd_Click(object sender, EventArgs e)
    ...{
        if (FileUpload1.HasFile && FileUpload1.PostedFile.ContentLength > 2)
        ...{
            string[] arr =...{ ".jpg", ".gif" };
            HWhere.Value = upFile.UploadFile(FileUpload1, "/Uploads/Link/", 1024, arr, HWhere.Value == "", HWhere.Value);
            if (HWhere.Value == "")
            ...{
                return;
            }
        }

        SqlParameter[] prams = new SqlParameter[]...{
            new SqlParameter("@dc_Id",SqlDbType.Decimal),
            new SqlParameter("@vc_LinkName",SqlDbType.VarChar,50),
            new SqlParameter("@vc_LinkUrl",SqlDbType.VarChar,200),
            new SqlParameter("@vc_LogoUrl",SqlDbType.VarChar,200),
            new SqlParameter("@i_Mid",SqlDbType.Int),
            new SqlParameter("@AdminId",SqlDbType.VarChar,200),
            new SqlParameter("@i_Ret",SqlDbType.Int)
        };

        prams[0].Value = Request["LId"] == null ? "0" : Request["LId"];
        prams[1].Value = txtLinkName.Text;
        prams[2].Value = txtLinkUrl.Text;
        prams[3].Value = HWhere.Value;
        prams[4].Value = Request["Mid"];
        prams[5].Value = Request.Cookies["AdminId"].Value;
        prams[6].Direction = ParameterDirection.Output;

        Db.ExecuteNonQuery(Db.myCon, CommandType.StoredProcedure, "Pap_HyperLink", prams);
        if (prams[6].Value.ToString() == "1")
        ...{
            if (Request["LId"] == null)
            ...{
                JS.MsgBox("提示：链接信息添加成功！");
            }
            else
            ...{
                JS.MsgBox("提示：链接信息编辑成功！");
            }
            JS.ReloadWindow();
        }
        JS.Redirect(Request.RawUrl);
    }
}

<%...@ Page Language="C#" AutoEventWireup="true" CodeFile="AddEditLinks.aspx.cs" Theme="StyleThemes"
    Inherits="Admin_Links_AddEditLinks" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>编辑友情链接信息</title>
    <meta http-equiv="Expires" content="0" />
    
    <link href="../Style/Style.css" rel="stylesheet" type="text/css" />

    <script language="javascript" src="../../JSBlock/UseCheck.js" type="text/javascript"></script>

    <script language="javascript" type="text/javascript">...
        function Check()
        ...{
            if(document.form1.txtLinkName.value=="")
            ...{
                alert("提示：请输入网站名称！");
                document.form1.txtLinkName.focus();
                return false;
            }
            if(document.form1.txtLinkUrl.value=="")
            ...{
                alert("提示：请输入网站链接地址！");
                document.form1.txtLinkUrl.focus();
                return false;
            }
            if(TestReg(document.form1.txtLinkUrl.value)==false)
            ...{
                alert("提示：请输入合法的链接地址！");
                document.form1.txtLinkUrl.select();
                return false;
            }
        }
    </script>

</head>
<body>
    <form id="form1" method="post" runat="server">
        <div class="divA">
            <table border="0" cellpadding="0" cellspacing="8" width="100%">
                <tr>
                    <td>
                        网站名称：<asp:TextBox ID="txtLinkName" runat="server" Width="173px"></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td>
                        链接地址：<asp:TextBox ID="txtLinkUrl" runat="server" Width="237px"></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td>
                        图片地址：<asp:FileUpload ID="FileUpload1" CssClass="btnA" runat="server" />
                    </td>
                </tr>
                <tr>
                    <td align="center" style="height: 50px;">
                        <asp:Button ID="btnAdd" OnClientClick="return Check();" runat="server" Text="确定"
                            OnClick="btnAdd_Click" />
                        &nbsp; &nbsp; &nbsp; &nbsp;
                        <input id="Reset1" class="btnA" type="reset" value="重置" />
                        &nbsp; &nbsp; &nbsp; &nbsp;
                        <input type="button" class="btnA" value="关闭" onclick="javascript:window.close();" />
                    </td>
                </tr>
            </table>
            <input type="hidden" id="HWhere" name="HWhere" runat="server" />
        </div>
    </form>
</body>
</html>

ASP.NET2.0中创建模态对话框（showModalDialog）用来向数据库中添加信息，点击提交按钮怎么不起作用？反而把这个网页在浏览器中显示出来添加信息即可成功！请高手指点我该怎么设计？