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POProblems in DropDownList with updatepanel
 

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  1. POProblems in DropDownList with updatepanel
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    <p>I have two DropDownList with update panel when i select value from first dropdownlist then in second dropdownlist display data related first. But there is problem at run time it can't display dropdownlist and continuously refresh this page.</p> <p>So please help to solve this problem.</p> <p>Here is my code ASPX PAGE</p> <pre><code>&lt;%@ Page Language="C#" AutoEventWireup="true" CodeFile="AddRoomPrice.aspx.cs" Inherits="AddRoomPrice" %&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html;charset=utf-8" /&gt; &lt;title&gt;Presha Admin&lt;/title&gt; &lt;style type="text/css"&gt; @import url("css/style.css"); @import url('css/style_text.css'); @import url('css/form-buttons.css'); @import url('css/link-buttons.css'); @import url('css/menu.css'); @import url('css/statics.css'); @import url('css/messages.css'); @import url('css/table-sorter.css'); @import url('css/tabs.css'); @import url('css/forms.css'); @import url('css/datepicker.css'); @import url('css/jquery.fancybox-1.3.4.css'); @import url('css/accordions.css'); @import url('css/jquery.treeview.css'); @import url('css/wysiwyg.css'); @import url('css/wysiwyg.modal.css'); @import url('css/wysiwyg-editor.css'); &lt;/style&gt; &lt;script type="text/javascript" src="js/jquery-1.6.2.min.js"&gt;&lt;/script&gt; &lt;link rel="shortcut icon" href="gfx/Favicon.png"&gt; &lt;link rel="stylesheet" type="text/css" href="css/component.css" /&gt; &lt;script type="text/javascript" src="js/modernizr.custom.js"&gt;&lt;/script&gt; &lt;!--[if lte IE 8]&gt; &lt;script type="text/javascript" src="js/excanvas.min.js"&gt;&lt;/script&gt; &lt;![endif]--&gt; &lt;/head&gt; &lt;body&gt; &lt;form id="form1" runat="server"&gt; &lt;asp:ScriptManager ID="ScriptManager1" runat="server"&gt; &lt;/asp:ScriptManager&gt; &lt;div class="container"&gt; &lt;div class="logo-labels"&gt; &lt;a href="Default.aspx"&gt;&lt;img id="logo" runat="server" src="~/gfx/logo.png" height="50" /&gt;&lt;/a&gt; &lt;ul&gt; &lt;li&gt;&lt;asp:Label ID="lblAdmin" runat="server" Text="Wel come "&gt;&lt;/asp:Label&gt;&lt;/li&gt; &lt;li class="logout"&gt;&lt;asp:LinkButton ID="lnkLogout" runat="server" onclick="lnkLogout_Click"&gt;&lt;span&gt;Logout&lt;/span&gt;&lt;/asp:LinkButton&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/div&gt; &lt;div class="menu-search"&gt; &lt;ul&gt; &lt;li&gt;&lt;a href="Default.aspx"&gt;Home&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Hotel&lt;/a&gt; &lt;ul&gt; &lt;li&gt;&lt;a href="HotelList.aspx"&gt;Hotel List&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="AddHotel.aspx"&gt;Add Hotel&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Hotel Album&lt;/a&gt; &lt;ul&gt; &lt;li&gt;&lt;a href="HotelAlbumList.aspx"&gt;Album List&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="AddHotelAlbum.aspx"&gt;Add Album&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Hotel Facility&lt;/a&gt; &lt;ul&gt; &lt;li&gt;&lt;a href="HotelFacilityList.aspx"&gt;Facility List&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="AddHotelFacility.aspx"&gt;Add Facility&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Category&lt;/a&gt; &lt;ul&gt; &lt;li&gt;&lt;a href="RoomCategoryList.aspx"&gt;Category List&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="AddRoomCategory.aspx"&gt;Add Category&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;li class="current"&gt;&lt;a href="#"&gt;Room Price&lt;/a&gt; &lt;ul&gt; &lt;li&gt;&lt;a href="RoomPriceList.aspx"&gt;Price List&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="AddRoomPrice.aspx"&gt;Add Price&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;li&gt;&lt;a href="AddFacility.aspx"&gt;New Facility&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="#"&gt;Admin&lt;/a&gt; &lt;ul&gt; &lt;li&gt;&lt;a href="AdminList.aspx"&gt;Admin List&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="AddAdmin.aspx"&gt;Add Admin&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;li&gt;&lt;a href="Inquiry.aspx"&gt;Inquiry&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a href="GetLatitudeLongitude.aspx" target="_blank"&gt;Map&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/div&gt; &lt;div class="breadcrumbs"&gt; &lt;ul&gt; &lt;li class="home"&gt;&lt;a href="Default.aspx"&gt;&lt;/a&gt;&lt;/li&gt; &lt;li class="break"&gt;&amp;#187;&lt;/li&gt; &lt;li&gt;&lt;a href="AddRoomPrice.aspx"&gt;Add Room Price&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/div&gt; &lt;div class="section"&gt; &lt;div class="box"&gt; &lt;div class="title"&gt; &lt;h2&gt;Add/Edit Room Category&lt;/h2&gt; &lt;/div&gt; &lt;div class="content forms"&gt; &lt;asp:UpdatePanel ID="UpdatePanel1" runat="server"&gt; &lt;ContentTemplate&gt; &lt;div class="line padding-left50"&gt; &lt;label&gt;Hotel&lt;/label&gt; &lt;asp:DropDownList ID="ddlHotel" runat="server" AutoPostBack="true" onselectedindexchanged="ddlHotel_SelectedIndexChanged"&gt; &lt;/asp:DropDownList&gt; &lt;/div&gt; &lt;/ContentTemplate&gt; &lt;Triggers&gt; &lt;asp:AsyncPostBackTrigger ControlID="ddlHotel" EventName="selectedindexchanged" /&gt; &lt;/Triggers&gt; &lt;/asp:UpdatePanel&gt; &lt;asp:UpdatePanel ID="UpdatePanel2" runat="server"&gt; &lt;ContentTemplate&gt; &lt;div class="line padding-left50"&gt; &lt;label&gt;Room Category&lt;/label&gt; &lt;asp:DropDownList ID="ddlCategory" runat="server"&gt; &lt;/asp:DropDownList&gt; &lt;/div&gt; &lt;/ContentTemplate&gt; &lt;Triggers&gt; &lt;asp:AsyncPostBackTrigger ControlID="ddlHotel" EventName="selectedindexchanged" /&gt; &lt;/Triggers&gt; &lt;/asp:UpdatePanel&gt; &lt;div class="line padding-left50"&gt; &lt;label&gt;Single Price&lt;/label&gt; &lt;asp:TextBox ID="txtSingle" runat="server" class="medium"&gt;&lt;/asp:TextBox&gt; &lt;/div&gt; &lt;div class="line padding-left50"&gt; &lt;label&gt;Double Price&lt;/label&gt; &lt;asp:TextBox ID="txtDouble" runat="server" class="medium"&gt;&lt;/asp:TextBox&gt; &lt;/div&gt; &lt;div class="line padding-left50"&gt; &lt;label&gt;Extra Bed Price&lt;/label&gt; &lt;asp:TextBox ID="txtExtraBed" runat="server" class="medium"&gt;&lt;/asp:TextBox&gt; &lt;/div&gt; &lt;div class="line padding-left50"&gt; &lt;label&gt;Meal Plan&lt;/label&gt; &lt;asp:TextBox ID="txtMealPlan" runat="server" class="medium"&gt;&lt;/asp:TextBox&gt; &lt;/div&gt; &lt;div class="line padding-left50"&gt; &lt;label&gt;Extra Meal Price&lt;/label&gt; &lt;asp:TextBox ID="txtExtraMeal" runat="server" class="medium"&gt;&lt;/asp:TextBox&gt; &lt;/div&gt; &lt;div class="line button" style="padding-left:325px"&gt; &lt;asp:Button ID="btnSubmit" runat="server" Text="Sumbit" CssClass="btn btn-2 btn-2d" onclick="btnSubmit_Click"&gt;&lt;/asp:Button&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;script type="text/javascript" src="js/superfish.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/supersubs.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/hoverIntent.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/jquery.flot.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/jquery.graphtable-0.2.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/jquery-ui.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/customInput.jquery.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/jquery.tablesorter.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/jquery.tablesorter.pager.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/jquery.sparkbox-select.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/jquery.fancybox-1.3.4.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/jquery.filestyle.mini.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/date.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/jquery.datepicker.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/jquery.treeview.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/jquery.tipsy.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/jquery.wysiwyg.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/plugins/wysiwyg.rmFormat.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/controls/wysiwyg.image.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/controls/wysiwyg.link.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/controls/wysiwyg.table.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="js/inline.js"&gt;&lt;/script&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>and here is CS code</p> <pre><code>using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; using BLL; public partial class AddRoomPrice : System.Web.UI.Page { clsbll bll = new clsbll(); protected void Page_Load(object sender, EventArgs e) { if (Session["admin"] != null) { lblAdmin.Text = "Wel Come " + Session["admin"].ToString(); } else { Response.Redirect("Login.aspx"); } if (!Page.IsPostBack) { if (Session["hotelID"] != null) { ddlHotel.SelectedValue = Session["hotelID"].ToString(); } ddlHotel.DataSource = bll.getHotel(); ddlHotel.DataTextField = "HName"; ddlHotel.DataValueField = "HotelID"; ddlHotel.DataBind(); ddlHotel.Items.Insert(0, "Select Hotel"); } } protected void btnSubmit_Click(object sender, EventArgs e) { bll.insertRoomPrice(txtSingle.Text, txtDouble.Text, txtExtraBed.Text, txtMealPlan.Text, txtExtraMeal.Text, Convert.ToInt32(ddlCategory.SelectedValue), Convert.ToInt32(ddlHotel.SelectedValue)); txtSingle.Text = ""; txtDouble.Text = ""; txtExtraBed.Text = ""; txtMealPlan.Text = ""; txtExtraMeal.Text = ""; ddlCategory.SelectedIndex = 0; ddlHotel.SelectedIndex = 0; Session.Remove("hotelID"); //Session.Remove("hotel"); } protected void ddlHotel_SelectedIndexChanged(object sender, EventArgs e) { ddlCategory.DataSource = bll.getCategoryByID(ddlHotel.SelectedValue); ddlCategory.DataTextField = "RCategoryNameBed"; ddlCategory.DataValueField = "RCategoryID"; ddlCategory.DataBind(); ddlCategory.Items.Insert(0, "Select Category"); } protected void lnkLogout_Click(object sender, EventArgs e) { Session.Remove("admin"); Response.Redirect("Login.aspx"); } } </code></pre> <p>So please reply as soon as possible</p> <p>Thanks</p>
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    1. COI think this must be page postback problem. Have you debug your code?
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    2. COyes i debug my code it continuously called page_load() event.
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      1. USVIPUL PARMAR
    3. COIt is Postback Event Problem.
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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