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combo box losing viewstate after validation

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ComboBox

This is a migrated thread and some comments may be shown as answers.

Lynn asked on 15 Dec 2011, 03:36 AM

I have several combo boxes on a single web page. I will include both the display (.aspx) code and the code behind code below shortly.

After page load, selecting an entry from the first combo box (Cycle) triggers the loading of both the second (Election) and third combo boxes (Political Race). All of this cascading works fine, until (for example) when the page does not validate due to the custom validation on the very last textbox on the page (Web Site URL).

If an error is found on this custom validation, the page is refreshed and both the second and third combo boxes (Election and Political Race) have lost their selections. Once this happens, then errors are displayed for the second and third combo boxes and for the "Web Site URL" as well and this creates a kind of "deadly embrace" that the user cannot remove themselves from.

My basic question is "Why are the Election and Political Race combo boxes losing their selection during this validation process and what can I do to prevent this loss?

Here is the .aspx code. The code behind follows.

<%@ Page Title="Campaign Finance - Create New Petition" Language="C#" MasterPageFile="~/Masters/EPSDev2.master" AutoEventWireup="true" CodeFile="NewPetition.aspx.cs" Inherits="NewPetition" %>

<asp:Content ID="Content1" ContentPlaceHolderID="PageHeadContent" Runat="Server">

</asp:Content>

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

<div style="width: 100%;">

<div style="float: left; background-color: White; padding: 10px;">

<table cellpadding="20" cellspacing="0" border="0" >

<tr>

<td width="5%">

</td>

<td align="center" width="90%" nowrap="nowrap">

<table cellpadding="0" cellspacing="15" id="TABLE1" >

<tr>

<td colspan="2" align="center" >

<h2>

<asp:Label ID="VoterAuthenticationLabel" runat="server" Text="Create New Petition"></asp:Label>

</h2>

</td>

</tr>

<tr>

<td colspan="2" align="center" style="font-weight: normal; height: 12px;">

<asp:Label ID="InfoLabel" runat="server" Text="(Please enter the information requested below and then click on the SUBMIT button)"></asp:Label>

</td>

</tr>

<tr>

<td colspan="2" align="center" style="font-weight: normal; height: 12px;">

</td>

</tr>

<tr>

<td colspan="2" align="left" style="font-weight: normal; height: 12px;">

<asp:Label ID="Label6" runat="server" Font-Bold="true" Text="CANDIDATE INFORMATION:"></asp:Label>

</td>

</tr>

<tr>

<td align="left">

<asp:Label ID="CycleLabel" runat="server" Text="Cycle:"></asp:Label>

</td>

<td align="left">

<telerik:RadComboBox ID="ElectionCycleList" runat="server" TabIndex="1" EnableEmbeddedSkins="true" Skin="Default" OnClientSelectedIndexChanging="LoadPoliticalRaceList" >

</telerik:RadComboBox>

<img alt="Required field" src="<%=ResolveUrl("images/required2.gif")%>" />

<asp:RequiredFieldValidator ID="ElectionCycleListReqd" ControlToValidate="ElectionCycleList"

ValidationGroup="DEForm" Display="Dynamic" runat="server" ErrorMessage="<br>You must select an Election Cycle from the list"

ForeColor="Red">

</asp:RequiredFieldValidator>

<asp:CustomValidator

ID="CustomValidator5"

runat="server"

ControlToValidate="ElectionCycleList"

ClientValidationFunction="validateCombo5"

ErrorMessage="<br>You must select an Election Cycle from the list"

ValidationGroup="DEForm" Display="Dynamic" ForeColor="Red"

>

</asp:CustomValidator>

</td>

</tr>

<tr>

<td align="left">

<asp:Label ID="Label14" runat="server" Text="Election:"></asp:Label>

</td>

<td align="left">

<telerik:RadComboBox ID="ElectionList" runat="server" TabIndex="1" OnClientItemsRequested="SearchItemsLoaded" OnItemsRequested="ElectionList_ItemsRequested" EnableEmbeddedSkins="true" Skin="Default"

EnableViewState="true" ViewStateMode="Enabled"

>

</telerik:RadComboBox>

<img alt="Required field" src="<%=ResolveUrl("images/required2.gif")%>" />

<asp:RequiredFieldValidator ID="ElectionListReqd" ControlToValidate="ElectionList"

ValidationGroup="DEForm" Display="Dynamic" runat="server" ErrorMessage="<br>You must select an Election from the list."

ForeColor="Red">

</asp:RequiredFieldValidator>

<asp:CustomValidator

ID="CustomValidator4"

runat="server"

ControlToValidate="ElectionList"

ClientValidationFunction="validateCombo4"

ErrorMessage="<br>You must select an Election from the list"

ValidationGroup="DEForm" Display="Dynamic" ForeColor="Red"

>

</asp:CustomValidator>

</td>

</tr>

<tr>

<td align="left">

<asp:Label ID="Label1" runat="server" Text="Political Race:"></asp:Label>

</td>

<td align="left">

<telerik:RadComboBox ID="PoliticalRaceList" Width="250px" runat="server" TabIndex="2" OnClientItemsRequested="SearchItemsLoaded" OnItemsRequested="PoliticalRaceList_ItemsRequested" EnableEmbeddedSkins="true" Skin="Default" >

</telerik:RadComboBox>

<img alt="Required field" src="<%=ResolveUrl("images/required2.gif")%>" />

<asp:RequiredFieldValidator ID="PoliticalRaceListReqd" ControlToValidate="PoliticalRaceList"

ValidationGroup="DEForm" Display="Dynamic" runat="server" ErrorMessage="<br>You must select a Political Race from the list"

ForeColor="Red">

</asp:RequiredFieldValidator>

<asp:CustomValidator

ID="CustomValidator3"

runat="server"

ControlToValidate="PoliticalRaceList"

ClientValidationFunction="validateCombo3"

ErrorMessage="<br>You must select a Political Race from the list"

ValidationGroup="DEForm" Display="Dynamic" ForeColor="Red"

>

</asp:CustomValidator>

</td>

</tr>

<tr>

<td align="left">

<asp:Label ID="Label12" runat="server" Text="Political Party:"></asp:Label>

</td>

<td align="left">

<telerik:RadComboBox ID="PoliticalPartyList" runat="server" TabIndex="3" EnableEmbeddedSkins="true" Skin="Default">

</telerik:RadComboBox>

<img alt="Required field" src="<%=ResolveUrl("images/required2.gif")%>" />

<asp:RequiredFieldValidator ID="RequiredFieldValidator1" ControlToValidate="PoliticalPartyList"

ValidationGroup="DEForm" Display="Dynamic" runat="server" ErrorMessage="<br>You must select a Political Party from the list"

ForeColor="Red">

</asp:RequiredFieldValidator>

<asp:CustomValidator

ID="CustomValidator2"

runat="server"

ControlToValidate="PoliticalPartyList"

ClientValidationFunction="validateCombo2"

ErrorMessage="<br>You must select a Political Party from the list"

ValidationGroup="DEForm" Display="Dynamic" ForeColor="Red"

>

</asp:CustomValidator>

</td>

</tr>

<tr>

<td align="left">

<asp:Label ID="Label2" runat="server" Text="Name:"></asp:Label>

</td>

<td align="left">

<telerik:RadTextBox ID="CandidateName" runat="server" MaxLength="50" Width="200px" TabIndex="4" EnableEmbeddedSkins="true" Skin="Default" ></telerik:RadTextBox>

<img alt="Required field" src="<%=ResolveUrl("images/required2.gif")%>" />

<asp:RequiredFieldValidator ID="CandidateNameReqd" ControlToValidate="CandidateName"

ValidationGroup="DEForm" Display="Dynamic" runat="server" ErrorMessage="<br>You must enter the Candidate's Name"

ForeColor="Red"></asp:RequiredFieldValidator>

</td>

</tr>

<tr>

<td align="left">

<asp:Label ID="Label3" runat="server" Text="Address:"></asp:Label>

</td>

<td align="left">

<telerik:RadTextBox ID="CandidateAddress1" runat="server" MaxLength="50" Width="200px" TabIndex="5" EnableEmbeddedSkins="true" Skin="Default"></telerik:RadTextBox> <img

alt="Required field" src="<%=ResolveUrl("images/required2.gif")%>" />

<asp:RequiredFieldValidator ID="CandidateAddress1Reqd" ControlToValidate="CandidateAddress1"

ValidationGroup="DEForm" Display="Dynamic" runat="server" ErrorMessage="<br>You must enter the Candidate's Address"

ForeColor="Red"></asp:RequiredFieldValidator>

</td>

</tr>

<tr>

<td align="left">

<asp:Label ID="Label13" runat="server" Text="Address 2:"></asp:Label>

</td>

<td align="left">

<telerik:RadTextBox ID="CandidateAddress2" runat="server" MaxLength="50" Width="200px" TabIndex="5" EnableEmbeddedSkins="true" Skin="Default" ></telerik:RadTextBox>

<br />

</td>

</tr>

<tr>

<td align="left">

<asp:Label ID="Label4" runat="server" Text="City, State, Zip Code:"></asp:Label>

</td>

<td align="left">

<telerik:RadTextBox ID="CandidateCity" runat="server" MaxLength="50" Width="200px" TabIndex="6" EnableEmbeddedSkins="true" Skin="Default"></telerik:RadTextBox>

<img alt="Required field" src="<%=ResolveUrl("images/required2.gif")%>" />

<telerik:RadTextBox ID="CandidateState" runat="server" MaxLength="2" Width="30px" TabIndex="7" Text="AZ" EnableEmbeddedSkins="true" Skin="Default"></telerik:RadTextBox>

<img alt="Required field" src="<%=ResolveUrl("images/required2.gif")%>" />

<telerik:RadTextBox ID="CandidateZipCode" runat="server" TabIndex="8" MaxLength="10" Width="75px" EnableEmbeddedSkins="true" Skin="Default"></telerik:RadTextBox>

<img alt="Required field" src="<%=ResolveUrl("images/required2.gif")%>" />

<asp:RequiredFieldValidator ID="CandidateCityReqd" ControlToValidate="CandidateCity"

ValidationGroup="DEForm" Display="Dynamic" runat="server" ErrorMessage="<br>You must enter the Candidate's City"

ForeColor="Red"></asp:RequiredFieldValidator>

<asp:RequiredFieldValidator ID="CandidateStateReqd" ControlToValidate="CandidateState"

ValidationGroup="DEForm" Display="Dynamic" runat="server" ErrorMessage="<br>You must enter the Candidate's State"

ForeColor="Red"></asp:RequiredFieldValidator>

<asp:RequiredFieldValidator ID="CandidateZipCodeReqd" ControlToValidate="CandidateZipCode"

ValidationGroup="DEForm" Display="Dynamic" runat="server" ErrorMessage="<br>You must enter the Candidate's Zip Code"

ForeColor="Red"></asp:RequiredFieldValidator>

</td>

</tr>

<tr>

<td align="left">

<asp:Label ID="Label5" runat="server" Text="County:"></asp:Label>

</td>

<td align="left">

<telerik:RadComboBox ID="CandidateCountyList" runat="server" TabIndex="9" EnableEmbeddedSkins="true" Skin="Default">

</telerik:RadComboBox>

<img alt="Required field" src="<%=ResolveUrl("images/required2.gif")%>" />

<asp:RequiredFieldValidator ID="CandidateCountyListReqd" ControlToValidate="CandidateCountyList"

ValidationGroup="DEForm" Display="Dynamic" runat="server" ErrorMessage="<br>You must select the Candidate's County from the list"

ForeColor="Red">

</asp:RequiredFieldValidator>

<asp:CustomValidator

ID="CustomValidator1"

runat="server"

ControlToValidate="CandidateCountyList"

ClientValidationFunction="validateCombo1"

ErrorMessage="<br>You must select the Candidate's County"

ValidationGroup="DEForm" Display="Dynamic" ForeColor="Red"

>

</asp:CustomValidator>

</td>

</tr>

<tr>

<td colspan="2" align="center" style="font-weight: normal; height: 12px;">

</td>

</tr>

<tr>

<td colspan="2" align="left" style="font-weight: normal; height: 12px;">

<asp:Label ID="Label7" runat="server" Font-Bold="true" Text="CONTACT INFORMATION:"></asp:Label>

</td>

</tr>

<tr>

<td align="left">

<asp:Label ID="Label8" runat="server" Text="Name:"></asp:Label>

</td>

<td align="left">

<telerik:RadTextBox ID="ContactName" runat="server" MaxLength="50" Width="200px" TabIndex="10" EnableEmbeddedSkins="true" Skin="Default"></telerik:RadTextBox> <img

alt="Required field" src="<%=ResolveUrl("images/required2.gif")%>" />

<asp:RequiredFieldValidator ID="ContactNameReqd" ControlToValidate="ContactName"

ValidationGroup="DEForm" Display="Dynamic" runat="server" ErrorMessage="<br>You must enter the Contact's Name"

ForeColor="Red"></asp:RequiredFieldValidator>

</td>

</tr>

<tr>

<td align="left">

<asp:Label ID="Label9" runat="server" Text="Telephone:"></asp:Label>

</td>

<td align="left">

<telerik:RadTextBox ID="ContactPhone" runat="server" MaxLength="25" Width="100px" TabIndex="11" EnableEmbeddedSkins="true" Skin="Default" ></telerik:RadTextBox><br />

</td>

</tr>

<tr>

<td align="left">

<asp:Label ID="Label10" runat="server" Text="Email Address:"></asp:Label>

</td>

<td align="left">

<telerik:RadTextBox ID="ContactEmailAddress" runat="server" MaxLength="256" Width="300px" TabIndex="12" EnableEmbeddedSkins="true" Skin="Default" ></telerik:RadTextBox><br />

</td>

</tr>

<tr>

<td align="left">

<asp:Label ID="Label11" runat="server" Text="Web Site URL:"></asp:Label>

</td>

<td align="left">

<telerik:RadTextBox ID="ContactWebSiteURL" runat="server" MaxLength="50" Width="200px" TabIndex="13" EnableEmbeddedSkins="true" Skin="Default" ></telerik:RadTextBox>

<asp:CustomValidator ID="ContactWebSiteURLCustom" ControlToValidate="ContactWebSiteURL"

ValidationGroup="DEForm" Display="Dynamic" runat="server" ErrorMessage="<br>If provided, the web site URL must be present on the Internet."

ForeColor="Red" OnServerValidate="ValidateURL" ></asp:CustomValidator>

</td>

</tr>

<tr>

<td colspan="2" align="center" style="font-weight: normal; height: 12px;">

<asp:Button ID="CreateButton" runat="server" Text="Create Petition" TabIndex="15" ValidationGroup="DEForm" onclick="CreateButton_Click" />

<asp:Button ID="CancelButton" runat="server" Text="Cancel Petition" TabIndex="16" onclick="CancelButton_Click" />

</td>

</tr>

<tr>

<td colspan="2" align="center" style="font-weight: normal; height: 12px;">

<img alt="Required field" src="<%=ResolveUrl("images/required2.gif")%>" />

-

<asp:Label ID="IndicatesRequiredLabel" runat="server" Text="Indicates a required field"></asp:Label>

<br />

<asp:Label ID="StatusLabel" ForeColor="Red" runat="server" />

<asp:ValidationSummary ID="ValidationSummary1" ValidationGroup="DEForm" DisplayMode="List"

ForeColor="Red" ShowSummary="False" runat="server" />

</td>

</tr>

</table>

</td>

<td width="5%">

</td>

</tr>

</table>

</div>

<div class="clear">

</div>

<script type="text/javascript">

function LoadPoliticalRaceList(combo, eventArqs) {

var searchcycleCombo = $find("<%=ElectionCycleList.ClientID%>");

var searchraceCombo = $find("<%=PoliticalRaceList.ClientID%>");

var searchelectionCombo = $find("<%=ElectionList.ClientID%>");

var item = eventArqs.get_item();

searchraceCombo.set_text("Loading...");

// if a cycle is selected

if (item.get_index() > 0) {

// this will fire the ItemsRequested event of the

// property type combobox passing the transaction type as a parameter

searchraceCombo.requestItems(item.get_value(), false);

}

else {

// the -Select a cycle- item was chosen

searchraceCombo.set_text(" ");

searchraceCombo.clearItems();

}

var item = eventArqs.get_item();

searchelectionCombo.set_text("Loading...");

// if a cycle is selected

if (item.get_index() > 0) {

// this will fire the ItemsRequested event of the

// property type combobox passing the transaction type as a parameter

searchelectionCombo.requestItems(item.get_value(), false);

}

else {

// the -Select a cycle- item was chosen

searchelectionCombo.set_text(" ");

searchelectionCombo.clearItems();

}

function SearchItemsLoaded(combo, eventArqs) {

if (combo.get_items().get_count() > 0) {

// pre-select the first item

combo.set_text(combo.get_items().getItem(0).get_text());

combo.get_items().getItem(0).highlight();

}

function validateCombo1(source, args) {

args.IsValid = false;

var combo = $find("<%= CandidateCountyList.ClientID %>");

var text = combo.get_text();

if (text.length < 1) {

args.IsValid = false;

}

else {

var node = combo.findItemByText(text);

if (node) {

var value = node.get_value();

if (value.length > 0) {

args.IsValid = true;

}

else {

args.IsValid = false;

}

function validateCombo2(source, args) {

args.IsValid = false;

var combo = $find("<%= PoliticalPartyList.ClientID %>");

var text = combo.get_text();

if (text.length < 1) {

args.IsValid = false;

}

else {

var node = combo.findItemByText(text);

if (node) {

var value = node.get_value();

if (value.length > 0) {

args.IsValid = true;

}

else {

args.IsValid = false;

}

function validateCombo3(source, args) {

args.IsValid = false;

var combo = $find("<%= PoliticalRaceList.ClientID %>");

var text = combo.get_text();

if (text.length < 1) {

args.IsValid = false;

}

else {

var node = combo.findItemByText(text);

if (node) {

var value = node.get_value();

if (value.length > 0) {

args.IsValid = true;

}

else {

args.IsValid = false;

}

function validateCombo4(source, args) {

args.IsValid = false;

var combo = $find("<%= ElectionList.ClientID %>");

var text = combo.get_text();

if (text.length < 1) {

args.IsValid = false;

}

else {

var node = combo.findItemByText(text);

if (node) {

var value = node.get_value();

if (value.length > 0) {

args.IsValid = true;

}

else {

args.IsValid = false;

}

function validateCombo5(source, args) {

args.IsValid = false;

var combo = $find("<%= ElectionCycleList.ClientID %>");

var text = combo.get_text();

if (text.length < 1) {

args.IsValid = false;

}

else {

var node = combo.findItemByText(text);

if (node) {

var value = node.get_value();

if (value.length > 0) {

args.IsValid = true;

}

else {

args.IsValid = false;

}

</script>

</asp:Content>

Now the code behind...

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using Telerik.Web.UI;

using System.Data.SqlClient;

using System.Configuration;

using System.Data;

using System.Text;

using System.Net;

using System.IO;

public partial class NewPetition : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

// The purpose of this page is to initiate the creation of a new petition.

// We need to check for the presence of the query string member '19' and if its value is 'edt'.

// If yes to both of these questions, then the user has already entered the data for a new petition but

// clicked the edit button on the next confirmation page.

// If the answer to either of these is no, then we will give the user an empty page to enter data into

// except for the three (3) combo boxes --the Election Cycle, Political Party and the County combo boxes.

// The Political Race combo box will be dynamically loaded after the user selects an Election Cycle.

if (!Page.IsPostBack)

{

// If this is the new petition data coming back for edit from the confirmation page,

// then load the screen controls up with the data

if (Request.QueryString["19"] == "edt")

{

this.CandidateName.Text = Request.QueryString["4"];

this.CandidateAddress1.Text = Request.QueryString["5"];

this.CandidateAddress2.Text = Request.QueryString["6"];

this.CandidateCity.Text = Request.QueryString["7"];

this.CandidateState.Text = Request.QueryString["8"];

this.CandidateZipCode.Text = Request.QueryString["9"];

this.ContactName.Text = Request.QueryString["11"];

this.ContactPhone.Text = Request.QueryString["12"];

this.ContactEmailAddress.Text = Request.QueryString["13"];

this.ContactWebSiteURL.Text = Request.QueryString["14"];

LoadElectionCycleList2(this.ElectionCycleList, Request.QueryString["1"]);

LoadPoliticalRaceList2(this.PoliticalRaceList, Request.QueryString["2"]);

LoadPoliticalPartyList2(this.PoliticalPartyList, Request.QueryString["3"]);

LoadCountyList2(this.CandidateCountyList, Request.QueryString["10"]);

LoadElectionList2(this.ElectionList, Request.QueryString["20"]);

}

else

// This is a new page request so only load the combo boxes,

// there is nothing else to do

{

this.CandidateName.Text = Convert.ToString(Session["CandidateFullName"]);

LoadElectionCycleList(this.ElectionCycleList);

LoadPoliticalPartyList(this.PoliticalPartyList);

LoadCountyList(this.CandidateCountyList);

}

else

{

string sCB1 = Convert.ToString(this.ElectionList.SelectedValue);

string sCB2 = Convert.ToString(this.PoliticalRaceList.SelectedValue);

string a = "abc";

}

protected void ElectionList_ItemsRequested(object o, RadComboBoxItemsRequestedEventArgs e)

{

// The user-selected Election Cycle value is passed to us so can correctly populate this list

LoadElectionList(this.ElectionList, e.Text);

}

private void LoadElectionList2(RadComboBox combobox, string cbval)

{

LoadElectionList(this.ElectionList, Request.QueryString["1"]);

this.ElectionList.SelectedValue = cbval;

}

private void LoadElectionCycleList2(RadComboBox combobox, string cbval)

{

LoadElectionCycleList(this.ElectionCycleList);

this.ElectionCycleList.SelectedValue = cbval;

}

private void LoadPoliticalRaceList2(RadComboBox combobox, string cbval)

{

LoadPoliticalRaceList(this.PoliticalRaceList, Request.QueryString["1"]);

//LoadPoliticalRaceList(this.PoliticalRaceList, Request.QueryString["15"]);

this.PoliticalRaceList.SelectedValue = cbval;

}

private void LoadPoliticalPartyList2(RadComboBox combobox, string cbval)

{

LoadPoliticalPartyList(this.PoliticalPartyList);

this.PoliticalPartyList.SelectedValue = cbval;

}

private void LoadCountyList2(RadComboBox combobox, string cbval)

{

LoadCountyList(this.CandidateCountyList);

this.CandidateCountyList.SelectedValue = cbval;

}

private void LoadElectionList(RadComboBox combobox, string electioncycleno)

{

SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["ElectronicPetitionSystemConnectionString"].ConnectionString);

SqlDataAdapter adapter = new SqlDataAdapter("SELECT TOP (100) PERCENT ElectionName, ElectionId, CycleId, ElectionDate FROM dbo.Elections WHERE (CycleId = " + electioncycleno + ") ORDER BY ElectionDate", connection);

DataTable dt = new DataTable();

adapter.Fill(dt);

combobox.DataTextField = "ElectionName";

combobox.DataValueField = "ElectionId";

combobox.DataSource = dt;

combobox.DataBind();

// Insert the first item.

combobox.Items.Insert(0, new RadComboBoxItem("- Select an election -"));

}

protected void ElectList_ItemsRequested(object o, RadComboBoxItemsRequestedEventArgs e)

{

// The user-selected Election Cycle value is passed to us so can correctly populate this list

LoadElectionList(this.ElectionList, e.Text);

}

private void LoadElectionCycleList(RadComboBox combobox)

{

SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["ElectronicPetitionSystemConnectionString"].ConnectionString);

SqlDataAdapter adapter = new SqlDataAdapter("SELECT CycleId, CycleName FROM Cycles WHERE EndDate > GETDATE() ORDER By CycleName", connection);

DataTable dt = new DataTable();

adapter.Fill(dt);

combobox.DataTextField = "CycleName";

combobox.DataValueField = "CycleId";

combobox.DataSource = dt;

combobox.DataBind();

// Insert the first item.

combobox.Items.Insert(0, new RadComboBoxItem("- Select a cycle -"));

}

protected void PoliticalRaceList_ItemsRequested(object o, RadComboBoxItemsRequestedEventArgs e)

{

// The user-selected Election Cycle value is passed to us so can correctly populate this list

LoadPoliticalRaceList(this.PoliticalRaceList, e.Text);

}

private void LoadPoliticalRaceList(RadComboBox combobox, string electioncycleno)

{

if (electioncycleno.Length > 0)

{

SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["ElectronicPetitionSystemConnectionString"].ConnectionString);

string sqlcode =

"SELECT Cycles.CycleId, Cycles.CycleName, Cycles.BeginDate, Races.RaceId, Offices.OfficeId, Offices.OfficeDescription FROM Cycles INNER JOIN Races ON Cycles.CycleId = Races.CycleId INNER JOIN Offices ON Races.OfficeId = Offices.OfficeId WHERE Cycles.CycleId = "

+ electioncycleno + " ORDER BY OfficeDescription";

SqlDataAdapter adapter = new SqlDataAdapter(sqlcode, connection);

DataTable dt = new DataTable();

adapter.Fill(dt);

combobox.DataTextField = "OfficeDescription";

combobox.DataValueField = "RaceId";

combobox.DataSource = dt;

combobox.DataBind();

// Insert the first item.

combobox.Items.Insert(0, new RadComboBoxItem("- Select a race"));

}

private void LoadPoliticalPartyList(RadComboBox combobox)

{

SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["ElectronicPetitionSystemConnectionString"].ConnectionString);

SqlDataAdapter adapter = new SqlDataAdapter("SELECT PartyId, PartyName, DisplayOrder FROM Parties ORDER By DisplayOrder", connection);

DataTable dt = new DataTable();

adapter.Fill(dt);

combobox.DataTextField = "PartyName";

combobox.DataValueField = "PartyId";

combobox.DataSource = dt;

combobox.DataBind();

// Insert the first item.

combobox.Items.Insert(0, new RadComboBoxItem("- Select a party -"));

}

private void LoadCountyList(RadComboBox combobox)

{

SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["ElectronicPetitionSystemConnectionString"].ConnectionString);

SqlDataAdapter adapter = new SqlDataAdapter("SELECT CountyId, CountyName FROM Counties ORDER By CountyName", connection);

DataTable dt = new DataTable();

adapter.Fill(dt);

combobox.DataTextField = "CountyName";

combobox.DataValueField = "CountyId";

combobox.DataSource = dt;

combobox.DataBind();

// Insert the first item.

combobox.Items.Insert(0, new RadComboBoxItem("- Select a county -"));

}

protected void CreateButton_Click(object sender, EventArgs e)

{

// Create the new petition if the input validates

if (Page.IsValid)

{

// If the data entered is valid, then send the user (and the data) to the Confirmation page to make

// certain that they actually do want to create the new petition before doing it, otherwise .NET will

// send them back to correct the data

string sQueryString = "";

sQueryString += "1=" + this.ElectionCycleList.SelectedValue;

sQueryString += "&2=" + this.PoliticalRaceList.SelectedValue;

sQueryString += "&3=" + this.PoliticalPartyList.SelectedValue;

sQueryString += "&4=" + this.CandidateName.Text;

sQueryString += "&5=" + this.CandidateAddress1.Text;

sQueryString += "&6=" + this.CandidateAddress2.Text;

sQueryString += "&7=" + this.CandidateCity.Text;

sQueryString += "&8=" + this.CandidateState.Text;

sQueryString += "&9=" + this.CandidateZipCode.Text;

sQueryString += "&10=" + this.CandidateCountyList.SelectedValue;

sQueryString += "&11=" + this.ContactName.Text;

sQueryString += "&12=" + this.ContactPhone.Text;

sQueryString += "&13=" + this.ContactEmailAddress.Text;

sQueryString += "&14=" + this.ContactWebSiteURL.Text;

sQueryString += "&15=" + this.ElectionCycleList.Text;

sQueryString += "&16=" + this.PoliticalRaceList.Text;

sQueryString += "&17=" + this.PoliticalPartyList.Text;

sQueryString += "&18=" + this.CandidateCountyList.Text;

sQueryString += "&20=" + this.ElectionList.SelectedValue;

sQueryString += "&21=" + this.ElectionList.Text;

Response.Redirect("NewPetitionConf.aspx?" + sQueryString);

}

protected void CancelButton_Click(object sender, EventArgs e)

{

// If the user cancels the new petition, then we need to back to MyeDocs.aspx

Response.Redirect("MyEDocs.aspx");

}

protected void ValidateURL(object source, ServerValidateEventArgs args)

{

args.IsValid = true;

WebRequest webRequest = null;

WebResponse webResponse = null;

try

{

webRequest = WebRequest.Create(this.ContactWebSiteURL.Text);

webResponse = webRequest.GetResponse();

}

catch (UriFormatException ex)

{

ContactWebSiteURLCustom.ErrorMessage = ex.Message;

args.IsValid = false;

}

catch (WebException ex)

{

ContactWebSiteURLCustom.ErrorMessage = ex.Message;

args.IsValid = false;

if (ex.Response != null && ex.Response.Headers != null)

{

ContactWebSiteURLCustom.ErrorMessage = ex.Message; //+ " - Web Exception - " + ex.Response.Headers.ToString();

args.IsValid = false;

}

ContactWebSiteURLCustom.ErrorMessage = ex.Message; //+ " - \nStack Trace Error - " + ex.ToString();

args.IsValid = false;

}

catch (Exception ex)

{

ContactWebSiteURLCustom.ErrorMessage = ex.Message; //+ " - \nStack Trace Error - " + ex.ToString();

args.IsValid = false;

}

finally

{

if (webResponse != null)

{

webResponse.Close();

}

Boolean bFlag = args.IsValid;

}

Sorry to have to load so much code. I hope you can give me an idea of how to resolve this problem.

Thanks in advance!

Lynn

3 Answers, 1 is accepted

Accepted

answered on 19 Dec 2011, 04:29 PM

Hello Lynn,

You could refer to the following online demo: RadComboBox/ Related ComboBoxes, it shows how a related RadComboBox scenario could be achieved. If you explore this demo a little bit more, you will notice that after the "Explore" button is clicked, by which a post-back to the server is made, the selections in the second and third RadComboBoxes are saved.

You could take a look at the Page_Load method in the code-behind file, to see how this behavior is implemented. It is also pasted below:

protected void Page_Load(object sender, EventArgs e)

{

if (!Page.IsPostBack)

// Fill the continents combo.

LoadContinents();

else if (!Page.IsCallback)

{

// On regular postbacks restore the items of the related ComboBoxes.

// Their selected items will be automatically restored from their ClientState.

LoadCountries(RadComboBox1.SelectedValue);

LoadCities(RadComboBox2.SelectedValue);

}

If you are still having troubles, you could send us a support ticket with a sample page containing the issues, attached to it. Please make sure that the sample page is runnable, so we will be able to troubleshoot this behavior locally.

All the best,
Ivana
the Telerik team

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