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RadComboBox datasource empty on postback

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ComboBox

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

Craig asked on 21 May 2012, 07:28 PM

Hello,

I am assigning a radcombobox's datasource property a List(of Person) and then databinding it. I have the Autopost property set to true so when a selection is made it will post back. Unfortunately, the radcombobox's datasource property is nothing when the postback occurs. Is there something I need to do to keep the datasource from being left to nothing? Since I can't attach a zip file I am providing code snippets.

Imports Telerik.Web.UI

Imports System.Linq

Partial Class _Default

Inherits System.Web.UI.Page

Private Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load

If Not Page.IsPostBack Then

Dim people = {New Person With {.Name = "Craig", .UserId = "Wil1"}, New Person With {.Name = "Kaitlyn", .UserId = "Wil2"}, New Person With {.Name = "Ben", .UserId = "Wil3"}}.ToList

radCbo.DataTextField = "Name" : radCbo.DataValueField = "UserId"

radCbo.DataSource = people

radCbo.DataBind()

End If

End Sub

Private Sub radCbo_SelectedIndexChanged(sender As Object, e As Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs) Handles radCbo.SelectedIndexChanged

Dim ds = radCbo.DataSource

Dim i = radCbo.SelectedItem.DataItem

End Sub

End Class

Public Class Person

Public Property Name As String

Public Property UserId As String

End Class

<%@ Page Language="VB" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="RadControlsWebAppComboTest._Default" %>

<!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></title>

<telerik:RadStyleSheetManager id="RadStyleSheetManager1" runat="server" />

</head>

<body>

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

<telerik:RadScriptManager ID="RadScriptManager1" runat="server">

<Scripts>

<%--Needed for JavaScript IntelliSense in VS2010--%>

<%--For VS2008 replace RadScriptManager with ScriptManager--%>

<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.Core.js" />

<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQuery.js" />

<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQueryInclude.js" />

</Scripts>

</telerik:RadScriptManager>

<script type="text/javascript">

//Put your JavaScript code here.

</script>

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">

</telerik:RadAjaxManager>

<div>

<telerik:RadComboBox runat="server" ID="radCbo" AutoPostBack="true" EnableViewState="true"></telerik:RadComboBox>

</div>

</form>

</body>

</html

RadComboBox datasource empty on postback

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