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Version Q2 2011 released 07/12/2011
select

ListBox / Add/Remove/Disable items

Available actions
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  • RadListBox provides rich server-side API. It allows the developer to easily add, remove or disable items.

    To add an item to the combo, simply create a new RadListBoxItem instance and add it to the Items collection of the combo:

    C#

    RadListBox1.Items.Add(new RadListBoxItem("Some Item"));

    VB.NET

    RadListBox1.Items.Add(New RadListBoxItem("Some Item"))

    To remove an item, simply call the Remove() method of the item.

    To disable an item, just set the Enabled property of the combo to false.

Source Code

C# VB.NET
Show code in new window Demo isolation steps
  • <%@ Page Language="C#" AutoEventWireup="true" CodeFile="DefaultCS.aspx.cs" Inherits="ListBox_Examples_Programming_AddRemoveDelete_Items_DefaultCS" %>

    <%@ Register TagPrefix="qsf" Namespace="Telerik.QuickStart" %>
    <%@ Register TagPrefix="qsf" TagName="Header" Src="~/Common/Header.ascx" %>
    <%@ Register TagPrefix="qsf" TagName="HeadTag" Src="~/Common/HeadTag.ascx" %>
    <%@ Register TagPrefix="qsf" TagName="Footer" Src="~/Common/Footer.ascx" %>
    <%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head runat="server">
        <qsf:HeadTag runat="server" ID="Headtag1" />
        <link rel="stylesheet" href="styles.css" type="text/css" />
    </head>
    <body class="BODY">
    <form runat="server" id="mainForm" method="post">
        <telerik:RadScriptManager ID="ScriptManager" runat="server" />
        <qsf:Header runat="server" ID="Header1" NavigationLanguage="C#" />
        
        <qsf:ConfiguratorPanel runat="server" ID="ConfigurationPanel1" Title="Available actions" Orientation="Vertical" CssClass="qsfRightConfig" Expanded="true">
            <ul class="qsfexAvailableActions">
                <li>
    <asp:Button CssClass="qsfButtonBig" ID="DisableButton" runat="server" OnClick="DisableButton_Click"
    ValidationGroup="DisableRequiresSelection" Text="Disable selected item(s)" />
    <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="Select a item first."
    ControlToValidate="RadListBox1" Display="Dynamic" ValidationGroup="DisableRequiresSelection" CssClass="validator"></asp:RequiredFieldValidator>
                </li>
                <li>
    <asp:Button CssClass="qsfButtonBig" ID="EnableAllButton" runat="server" CausesValidation="False"
    OnClick="EnableAll_Button" Text="Enable all items" />
                </li>
                <li>
    <asp:Button CssClass="qsfButtonBig" ID="DeleteButton" runat="server" OnClick="DeleteButton_Click"
    ValidationGroup="DeleteRequiresSelection" Text="Delete selected item(s)" />
    <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ErrorMessage="Select a item first."
    Display="Dynamic" ControlToValidate="RadListBox1" ValidationGroup="DeleteRequiresSelection" CssClass="validator"></asp:RequiredFieldValidator>
                </li>
                <li>
                    <telerik:RadTextBox runat="Server" ID="itemTextBox" EmptyMessage="Enter item text"></telerik:RadTextBox>
    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Text is required"
    Display="Dynamic" ControlToValidate="itemTextBox" ValidationGroup="TextRequired" CssClass="validator" />
                </li>
                <li>
    <asp:Button CssClass="qsfButton" ID="AddButton" runat="server" OnClick="AddButton_Click"
    ValidationGroup="TextRequired" Text="Add new item" />
                </li>
            </ul>
        </qsf:ConfiguratorPanel>
            
        <telerik:RadListBox
            runat="server" ID="RadListBox1"
            Height="210px"
            SelectionMode="Multiple" />
                
        <qsf:Footer runat="server" ID="Footer1" />
    </form>
    </body>
    </html>

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