C# 在asp.net中使用更新面板的postbacktrigger中的按钮后，背景图像消失

在asp.net中使用更新面板的postbacktrigger中的按钮后，背景图像消失。我已经设计了注册表单，并将所有控件放置在更新面板中。单击submit按钮后，数据被提交，页面刷新，背景图像显示。值被正确插入数据库中。 PFB Registration.aspx的HTML代码：-

        <%@ Page Title="" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Register.aspx.cs" Inherits="Register" %>
        <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
        <%@ Register Src="~/UserControls/FacebookUserControl.ascx" TagName="facebookheader" TagPrefix="Uc1"%>

        <asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
            <style type="text/css">
                .auto-style1 {
                    width: 100%;
                }
            </style>
            <script type="text/javascript">
                function HideCtrl(ctrl, timer) {
                    var ctry_array = ctrl.split(","); 
                    var num = 0, arr_length = ctry_array.length; 
                    while (num < arr_length) {
                        if (document.getElementById(ctry_array[num])) {
                            setTimeout('document.getElementById("' + ctry_array[num] + '").style.display = "none";', timer);
                        } 
                        num += 1;
                    }
                    return false;
                }
            </script>
             <script>
                 $(function () {
                     //  Initialize Backgound Stretcher
                     $('BODY').bgStretcher({
                         images: ['images/slide-1.jpg'],
                         imageWidth: 1600,
                         imageHeight: 964,
                         resizeProportionally: true

                     });
                 });
            </script>

        </asp:Content>
        <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

            <form id="form1" runat="server">

                <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"></asp:ToolkitScriptManager> 

            <section id="content">
            <div class="main-block">
                <div class="container_12">
                    <div class="wrapper">

                        <table>
                            <tr>
                                <td>
                                    <asp:ValidationSummary ID="ValidationSummary1" runat="server" ValidationGroup="vg1" HeaderText="Fields marked with (*) are required" 
                                        ForeColor="Red" CssClass="error" />
                                </td>
                            </tr>
                            <tr>
                                <td>
                                    <div id="divErrorMess" runat="server" visible="false" class="mess">
                                        <asp:Label ID="lblMessage" runat="server" ForeColor="Red" Visible="False"></asp:Label>
                                    </div>
                                    <div id="divBallon" runat="server" visible="false" class="mess">
                                        <div>
                                            <asp:Label ID="lblMessage2" runat="server" Visible="False" ForeColor="Red"></asp:Label>
                                        </div>
                                    </div>
                                </td>
                            </tr>
                        </table>
                        <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
                            <ContentTemplate>
                        <table style="width:358px; border:0;">
                    <tr>
                        <td>&nbsp;Full Name</td>
                    </tr>
                    <tr>
                        <td>&nbsp;<asp:TextBox ID="txtFullName" runat="server" placeholder="Enter your Full Name" ValidationGroup="vg1" Width="250px"></asp:TextBox>
                            &nbsp;<span style="color:red">*</span>&nbsp;
                            <asp:RequiredFieldValidator ID="rfvFullName" runat="server" ErrorMessage="" 
                                ControlToValidate="txtFullName" Display="None" ForeColor="Red" SetFocusOnError="True" 
                                ValidationGroup="vg1"></asp:RequiredFieldValidator>
                        </td>
                    </tr>
                    <tr>
                        <td>&nbsp;Date Of Birth</td>
                    </tr>                    
                    <tr>
                        <td>&nbsp;<%--<asp:TextBox ID="txtDateOfBirth" runat="server" placeholder="Enter your Date Of Birth" ValidationGroup="vg1" Width="250px" ClientIDMode="Static">
                                  </asp:TextBox>--%><%--                    &nbsp;<span style="color:red">*</span>&nbsp;<asp:CalendarExtender ID="CalendarExtender1" runat="server" Format="MM-dd-yyyy" 
                                TargetControlID="txtDateOfBirth"></asp:CalendarExtender>--%><%-- <asp:RequiredFieldValidator ID="rfvDob" runat="server" ErrorMessage="" 
                                ControlToValidate="txtDateOfBirth" Display="None" ForeColor="Red" SetFocusOnError="True" 
                                ValidationGroup="vg1"></asp:RequiredFieldValidator>--%><asp:DropDownList ID="ddlMonth" runat="server" OnSelectedIndexChanged="ddlMonth_SelectedIndexChanged" placeholder="Month" AutoPostBack="true">
                              </asp:DropDownList>&nbsp;<span style="color:red">*</span>&nbsp;
                            <asp:RequiredFieldValidator ID="rfvMonth" 
                                  runat="server" ErrorMessage="*" ControlToValidate="ddlMonth" ForeColor="Red" 
                                  SetFocusOnError="True" ValidationGroup="vg1"></asp:RequiredFieldValidator>&nbsp;
                              <asp:DropDownList ID="ddlDate" runat="server" AutoPostBack="true">
                              </asp:DropDownList>&nbsp;<span style="color:red">*</span>&nbsp;
                            <asp:RequiredFieldValidator ID="rfvDate" 
                                  runat="server" ErrorMessage="*" ControlToValidate="ddlDate" ForeColor="Red" 
                                  SetFocusOnError="True" ValidationGroup="vg1"></asp:RequiredFieldValidator>&nbsp;
                              <asp:DropDownList ID="ddlYear" runat="server" OnSelectedIndexChanged="ddlYear_SelectedIndexChanged" AutoPostBack="true">

                              </asp:DropDownList>&nbsp;<span style="color:red">*</span>&nbsp;
                              <asp:RequiredFieldValidator ID="rfvYear" runat="server" 
                                  ErrorMessage="*" 
                                  ForeColor="Red" SetFocusOnError="True" ValidationGroup="vg1" 
                                  ControlToValidate="ddlYear"></asp:RequiredFieldValidator>

                        </td>
                    </tr>
                    <tr>
                        <td>&nbsp;Phone Number</td>
                    </tr>
                    <tr>
                        <td>&nbsp;<asp:TextBox ID="txtPhoneNumber" runat="server" placeholder="Enter your Phone Number" ValidationGroup="vg1" Width="250px">
                                  </asp:TextBox>
                            &nbsp;<span style="color:red">*</span>&nbsp;
                            <asp:RequiredFieldValidator ID="rfvPhone" runat="server" ErrorMessage="" 
                                ControlToValidate="txtPhoneNumber" Display="None" ForeColor="Red" SetFocusOnError="True" 
                                ValidationGroup="vg1"></asp:RequiredFieldValidator>&nbsp;
                            <asp:RegularExpressionValidator ID="revPhone" runat="server" ErrorMessage="Enter only 10 digit number" 
                                ControlToValidate="txtPhoneNumber" Display="None" ForeColor="Red" SetFocusOnError="True" 
                                ValidationExpression="^[0-9]{10}" ValidationGroup="vg1"></asp:RegularExpressionValidator>
                        </td>
                    </tr>
                    <tr>
                        <td>&nbsp;Email Address</td>
                    </tr>
                    <tr>
                        <td>&nbsp;<asp:TextBox ID="txtEmail" runat="server" placeholder="Enter your Email address" ValidationGroup="vg1" Width="250px">
                                  </asp:TextBox>
                            &nbsp;<span style="color:red">*</span>&nbsp;
                            <asp:RequiredFieldValidator ID="rfvEmail" runat="server" ErrorMessage="" 
                                ControlToValidate="txtEmail" Display="None" ForeColor="Red" SetFocusOnError="True" 
                                ValidationGroup="vg1"></asp:RequiredFieldValidator>&nbsp;
                            <asp:RegularExpressionValidator ID="revEmail" runat="server" ErrorMessage="Invalid Email!" 
                                ControlToValidate="txtEmail" Display="None" ForeColor="Red" SetFocusOnError="True" 
                                ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" ValidationGroup="vg1">
                            </asp:RegularExpressionValidator>
                        </td>
                    </tr>
                    <tr>
                        <td>&nbsp;Submit 2 Photos</td>
                    </tr>
                    <tr>
                        <td>&nbsp;<asp:FileUpload ID="FileUpload1" runat="server"  Width="250px" />
                            &nbsp;<span style="color:red">*</span>&nbsp;
                            <asp:RequiredFieldValidator ID="rfvPhoto1" runat="server" ErrorMessage="" 
                                ControlToValidate="FileUpload1" Display="None" ForeColor="Red" SetFocusOnError="True" 
                                ValidationGroup="vg1"></asp:RequiredFieldValidator>
                        </td>
                    </tr>
                    <tr>
                        <td>&nbsp;<asp:FileUpload ID="FileUpload2" runat="server" Width="250px"/>
                            &nbsp;<span style="color:red">*</span>&nbsp;
                            <asp:RequiredFieldValidator ID="rfvPhoto2" runat="server" ErrorMessage="" 
                                ControlToValidate="FileUpload2" Display="None" ForeColor="Red" SetFocusOnError="True" 
                                ValidationGroup="vg1"></asp:RequiredFieldValidator>
                        </td>
                    </tr>
                    <tr>
                        <td>&nbsp;Terms & Conditions</td>
                    </tr>
                    <tr>
                        <td>&nbsp;<asp:CheckBox ID="chkAgree" runat="server" />&nbsp;I agree to Terms and Conditions</td>
                    </tr>
                    <tr>
                        <td>&nbsp;<asp:ImageButton ID="btnSubmit" runat="server" ImageUrl="~/images/submit.png" OnClick="btnSubmit_Click" ValidationGroup="vg1" />&nbsp;&nbsp;
                            <asp:ImageButton ID="btnReset" runat="server" ImageUrl="~/images/reset.png" CausesValidation="False" OnClick="btnReset_Click" />
                        </td>
                    </tr>
                    <tr>
                        <td>&nbsp;</td>
                    </tr>
                </table>
                                </ContentTemplate>
                            <Triggers>
                                <asp:AsyncPostBackTrigger ControlID="ddlMonth" EventName="SelectedIndexChanged" />
                                <asp:AsyncPostBackTrigger ControlID="ddlDate" EventName="SelectedIndexChanged" />
                                <asp:AsyncPostBackTrigger ControlID="ddlYear" EventName="SelectedIndexChanged" />
                                <asp:PostBackTrigger ControlID="btnSubmit"                        />                        
                            </Triggers>
                            </asp:UpdatePanel>
                    </div>
                </div>
                <div class="sidebar">
                    <Uc1:facebookheader ID="fbtag" runat="server" />
                </div>
            </div>                     



            </section> 
        <%--    </div> --%>     
            </form>
        </asp:Content>

.auto-style1{
宽度：100%；
}
函数HideCtrl（ctrl、定时器）{
var ctry_array=ctrl.split（“，”）；
var num=0，arr_length=ctry_array.length；
while（num

注册的PFB代码。aspx.cs:

下面的代码包含registration.aspx的数据。在下文中，我使用dropdownlist输入日期作为输入，并对日期执行必要的验证。我使用arraylist添加月份，使用for loop添加年份。我还使用CheckLeapYear fn检查闰年

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.ComponentModel.DataAnnotations;
    using System.Data;
    using System.Data.SqlClient;
    using System.Configuration;
    using System.IO;
    using System.Net.Mail;
    using System.Collections;

    public partial class Register : System.Web.UI.Page
    {
        int year;
        string month;
        protected void Page_Load(object sender, EventArgs e)
        {
            //System.Web.UI.HtmlControls.HtmlGenericControl divmain = (System.Web.UI.HtmlControls.HtmlGenericControl)Master.FindControl("divmain");
            //divmain.Attributes.Add("class", "extra-block");        
            if (!IsPostBack)
            {
                this.Page.Title = "Register Us With Now to kick start your Career in MatureModelling";
                this.Page.MetaDescription = 
                   "MatureModelling connects new faces and models with scouts, international model photo " 
                   + "shoot and photographers. Casting Directors are now Looking" 
                   + " For real Models To Front Their Campaigns.";
                this.Page.MetaKeywords = 
                   "international photographers, expert model advice";

                System.Web.UI.HtmlControls.HtmlGenericControl aRegister = (System.Web.UI.HtmlControls.HtmlGenericControl)Master.FindControl("Register");
                aRegister.Attributes.Add("class", "current");

                Response.Cache.SetNoStore();


                DateTime tnow = DateTime.Now;

                ArrayList ayear = new ArrayList();
                int i;
                for (i = 1970; i <= DateTime.Now.Year; i++)
                {
                    ayear.Add(i);
                }

                ArrayList amonth = new ArrayList();
                amonth.Add("Jan");
                amonth.Add("Feb");
                amonth.Add("Mar");
                amonth.Add("Apr");
                amonth.Add("May");
                amonth.Add("Jun");
                amonth.Add("Jul");
                amonth.Add("Aug");
                amonth.Add("Sep");
                amonth.Add("Oct");
                amonth.Add("Nov");
                amonth.Add("Dec");            

                ddlYear.DataSource = ayear;
                ddlYear.DataBind();

                ddlMonth.DataSource = amonth;
                ddlMonth.DataBind();

                ddlYear.SelectedValue = tnow.Year.ToString();
                ddlMonth.SelectedValue = tnow.Month.ToString();

                year = Int32.Parse(ddlYear.SelectedValue);
                month = Convert.ToString(ddlMonth.SelectedValue);

                BindDays(year, month);
                ddlDate.SelectedValue = tnow.Day.ToString();
            }
        }

        #region Button Event
        protected void btnSubmit_Click(object sender, ImageClickEventArgs e)
        {
            lblMessage.Text = "";
            string strScript = string.Empty;
            string strCtrl = divErrorMess.ClientID;
            strScript = "HideCtrl('" + strCtrl + "', '3000')";
            try
            {
                if (chkAgree.Checked)
                {
                    Registration objRegistration = new Registration();

                    objRegistration.FirstName = txtFullName.Text.Trim().ToString();
                    //objRegistration.BirthDate = txtDateOfBirth.Text.Trim().ToString();
                    objRegistration.BirthDate = ddlYear.SelectedItem.Text.ToString() 
                                                + "-" + ddlMonth.SelectedItem.Value.ToString() 
                                                + "-" + ddlDate.SelectedItem.Text.ToString();
                    objRegistration.EmailId = txtEmail.Text.Trim().ToString();
                    objRegistration.PhoneNo = txtPhoneNumber.Text.Trim().ToString();

                    if (FileUpload1.HasFile)
                    {

                        objRegistration.Photo1 = DateTime.Now.ToString("ddMMyyyy") + FileUpload1.FileName.ToString();
                    }
                    string pathBig = Server.MapPath("~\\ModelPhotos\\" + DateTime.Now.ToString("ddMMyyyy") + FileUpload1.FileName.ToString());
                    ViewState["pathBig"] = pathBig;
                    if (File.Exists(pathBig))
                    {
                        //File.Delete(pathBig);
                        FileUpload1.SaveAs(pathBig);
                    }
                    else
                    {
                        FileUpload1.SaveAs(pathBig);
                    }

                    if (FileUpload2.HasFile)
                    {
                        objRegistration.Photo2 = DateTime.Now.ToString("ddMMyyyy") + FileUpload2.FileName.ToString();
                    }
                    string pathBig1 = Server.MapPath("~\\ModelPhotos\\" + DateTime.Now.ToString("ddMMyyyy")+FileUpload2.FileName.ToString());
                    ViewState["pathBig1"] = pathBig1;
                    if (File.Exists(pathBig1))
                    {
                        //File.Delete(pathBig1);
                        FileUpload2.SaveAs(pathBig1);
                    }
                    else
                    {
                        FileUpload2.SaveAs(pathBig1);
                    }

                    if (chkAgree.Checked)
                    {
                        objRegistration.IsAgree = "true";
                    }
                    else
                    {
                        objRegistration.IsAgree = "false";
                    }

                    RegistrationOperation objRegisterOperation = new RegistrationOperation();
                    int k = Convert.ToInt32(objRegisterOperation.InsertRegisterUser(objRegistration));

                    if (k==0)
                    {
                        divErrorMess.Visible = false;
                        divBallon.Visible = true;
                        lblMessage2.Visible = true;
                        lblMessage2.ForeColor = System.Drawing.Color.Green;
                        lblMessage2.Text = "User Created Successfully!";
                        lblMessage.Text = string.Empty;
                        Session["result"] = "insert";
                       // sendmail();
                       // sendmailtoadmin();
                        fnClearControls();
                        divBallon.Visible = true;
                        strScript="HideCtrl('"+divBallon.ClientID+"','3000')";
                    }
                    else if (k==1)
                    {
                        divErrorMess.Visible = true;
                        lblMessage.Visible = true;
                        lblMessage.ForeColor = System.Drawing.Color.Red;
                        lblMessage.Text = "Sorry,Please try again!";
                        divBallon.Visible = false;
                    }
                    else if (k==2)
                    {
                        divErrorMess.Visible = true;
                        lblMessage.Visible = true;
                        lblMessage.ForeColor = System.Drawing.Color.Blue;
                        lblMessage.Text = "Email Id already exists!";
                        divBallon.Visible = false;
                    }

                }
                else
                {
                    divErrorMess.Visible = true;
                    lblMessage.Visible = true;
                    lblMessage.ForeColor = System.Drawing.Color.Orange;
                    lblMessage.Text = "Please accept terms & conditions";
                    divBallon.Visible = false;
                }
            }
            catch (Exception ex)
            {

                throw ex;
            }
           Page.ClientScript.RegisterStartupScript(this.GetType(), Guid.NewGuid().ToString(), strScript, true);
        }


        protected void btnReset_Click(object sender, ImageClickEventArgs e)
        {
            fnClearControls();
            divBallon.Visible = false;
            divErrorMess.Visible = false;
        }

        #endregion

        #region Private Method

        private void fnClearControls()
        {
            txtFullName.Text = " ";
            //txtLastName.Text = "";
            txtPhoneNumber.Text = "";
            // txtParentsPhoneNumber.Text = "";
            txtEmail.Text = "";
            chkAgree.Checked = false;
            //txtDateOfBirth.Text = "";
            ddlDate.SelectedIndex = 0;
            ddlMonth.SelectedIndex = 0;
            ddlYear.SelectedValue = Convert.ToString(DateTime.Now.Year);

        }  


        public void FillDays()
        {
            ddlDate.Items.Clear();
            //getting numbner of days in selected month & year
            int noofdays = DateTime.DaysInMonth(Convert.ToInt32(ddlYear.SelectedValue), Convert.ToInt32(ddlMonth.SelectedValue));

            //Fill days
            for (int i = 0; i <= noofdays; i++)
            {
                ddlDate.Items.Add(i.ToString());
            }
            ddlDate.Items.FindByValue(System.DateTime.Now.Day.ToString()).Selected = true;
        }

        private bool CheckLeapYear(int year)
        {
            if ((year%4==0)&&(year%100!=0)||(year%400==0))        
                return true;
                else return false;

        }

        private void BindDays(int year, string month)
        {
            int i;
            ArrayList aday = new ArrayList();
            switch (month)
            {
                case "Jan":
                case "Mar":
                case "May":
                case "Jul":
                case "Aug":
                case "Oct":
                case "Dec":
                    for (i = 1; i <= 31; i++)
                    {
                        aday.Add(i);
                    }
                    break;
                case "Feb":

                    if (CheckLeapYear(year))
                    {
                        for (i = 1; i <= 29; i++)
                            aday.Add(i);
                    }
                    else
                    {
                        for (i = 1; i <= 28; i++)
                            aday.Add(i);
                    }
                    break;
                case "Apr":
                case "Jun":
                case "Sep":
                case "Nov":
                    for (i = 1; i <= 30; i++)
                        aday.Add(i);
                    break;
            }

            ddlDate.DataSource = aday;
            ddlDate.DataBind();
        }

        #endregion

    Following are dropdownlist events adn BindDays fn is used.
        #region DDL events

        protected void ddlYear_SelectedIndexChanged(object sender, EventArgs e)
        {
            year = Int32.Parse(ddlYear.SelectedValue);
            month = Convert.ToString(ddlMonth.SelectedValue);
            BindDays(year, month);
        }
Following are dropdownlist events adn BindDays fn is used.
        protected void ddlMonth_SelectedIndexChanged(object sender, EventArgs e)
        {
            year = Int32.Parse(ddlYear.SelectedValue);
            month = Convert.ToString(ddlMonth.SelectedValue);
            BindDays(year, month);
        }

        #endregion
    }

使用系统；
使用System.Collections.Generic；
使用System.Linq；
使用System.Web；
使用System.Web.UI；
使用System.Web.UI.WebControl；
使用System.ComponentModel.DataAnnotations；
使用系统数据；
使用System.Data.SqlClient；
使用系统配置；
使用System.IO；
使用System.Net.Mail；
使用系统集合；
公共部分类注册：System.Web.UI.Page
{
国际年；
弦月；
受保护的无效页面加载（对象发送方、事件参数e）
{
//System.Web.UI.HtmlControls.HtmlGenericControl divmain=（System.Web.UI.H
function pageLoad() { 
    $('BODY').bgStretcher({
        images: ['images/slide-1.jpg'],
        imageWidth: 1600,
        imageHeight: 964,
        resizeProportionally: true
    });
}