Transfer throws exception

[Ed]

First, I am using version 2013.2.717.40.
I set-up a very simple RadListBox transfer scenario:
     

<telerik:RadListBox ID="StatusListBoxSource" runat="server" 

    AllowTransfer="True" DataSourceID="StatusDataSource" DataTextField="Description" 

    DataValueField="StatusId" TransferToID="StatusListBoxTarget" 

    Height="240px" Width="150px">
</telerik:RadListBox>
<telerik:RadListBox ID="StatusListBoxTarget" runat="server" Height="240px" Width="150px"></telerik:RadListBox>

There is a RadButton that is used to indicate that the user is ready to process the infiormation in the second box:

<telerik:RadButton ID="DiagnoticStatusButton" runat="server" Text="Apply" AutoPostBack="True" 
    OnClick="DiagnoticStatusButton_Click">
</telerik:RadButton>

There is a label used to display the results of the processing:

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

And an AjaxSetting to connect the button and the label:
   

<telerik:AjaxSetting AjaxControlID="DiagnoticStatusButton">
    <UpdatedControls>
        <telerik:AjaxUpdatedControl ControlID="DiagnosticStatusLabel" />
    </UpdatedControls>
</telerik:AjaxSetting>

The first time I transfer an item from the source box to the target box and click the button, everything works just fine. If I transfer another, without removing the first, and click the button, also works fine. However, when I transfer any more and click the button, I get an error that is caught in the Global.aspx.cs file with the Server class being something that does not contain a GetLastError method. This is before it gets into the button event handler in the code behind.

Another issue, around which I am able to work is that, after transfering one item, a second click of the button reveals that there are 2 entries in the targetbox.items collection.

Here is the code for the button click event:

protected void DiagnoticStatusButton_Click ( object sender, EventArgs e )
    {
      ED.GenericResponse GR = new ED.GenericResponse ();
      List<String> IssueList = new List<String> ();
      List<Byte> StatusIdList = new List<Byte> ();
      var q = ( from si in this.StatusListBoxTarget.Items
                select si.Value ).Distinct ();
      foreach ( String item in q )
      {
        StatusIdList.Add ( Byte.Parse ( item ) );
      }
      try
      {
        using ( EDG.GroupsDataContext ctx = new EDG.GroupsDataContext () )
        {
          Int32 EffectedRows = ctx.AddDevicesByCriteria ( this.GroupId, DateTime.Now.AddDays ( -1 ).Date, StatusIdList, IssueList );
          this.DiagnosticStatusLabel.Text = String.Format ( "{0} devices added", EffectedRows );
        }
      }
      catch ( Exception Ex )
      {
        Logger.ErrorException ( Ex.Message, Ex );
        this.DiagnosticStatusLabel.Text = "There was an error adding from diagnostic status";
      }
    }

Unfortunately, there may be no way for you to reproduce this, but any suggestions would be accepted and appreciated.

Thanks,

Ed

[Ed]

Additional Information:

I was previously experiencing an exception regarding an index being out of range. This stopped when the new exception was thrown without any changes.

[Ed]

Now we know the rest of the story:

I was using a LinqDataSource to provide the data for the source list box. When I changed that to providing the data source as a list in the PageLoad event, the issue was resolved.

[Ed]

Well, I thought it was fixed. I still get an exception when I click the button a second time without transferring any items. This does not happen all of the time, but enough to make it problematic.

[Ed]

I finally was able to trap the exception:

2013-08-21 10:08:00.9082 | Error | EnterpriseWeb.Global.Application_Error | Exception of type System.ArgumentOutOfRangeException thrown
2013-08-21 10:08:00.9082 | Error | EnterpriseWeb.Global.Application_Error | Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index    at System.Collections.ArrayList.get_Item(Int32 index)
   at System.Web.UI.StateManagedCollection.System.Collections.IList.get_Item(Int32 index)
   at Telerik.Web.UI.ControlItemCollection.get_Item(Int32 index)
   at Telerik.Web.UI.ClientStateLogPlayer`1.Remove(ControlItemCollection items, Int32 index)
   at Telerik.Web.UI.ClientStateLogPlayer`1.Play(ClientStateLogEntry entry)
   at Telerik.Web.UI.ClientStateLogPlayer`1.Play(IEnumerable`1 clientStateLogEntry)
   at Telerik.Web.UI.RadListBox.LoadLogEntries(RadListBoxClientState clientState)
   at Telerik.Web.UI.RadListBox.LoadClientState(RadListBoxClientState clientState)
   at Telerik.Web.UI.RadListBox.LoadPostData(String postDataKey, NameValueCollection postCollection)
   at Telerik.Web.UI.RadDataBoundControl.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection)
   at System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

[Bozhidar]

Hello Ed,

Please review the following forum topic, which explains in detail what's causing this issue, and how you can fix it:
http://www.telerik.com/community/forums/aspnet-ajax/listbox/index-was-out-of-range-must-be-non-negative-and-less-than-the-size-of-the-collection-parameter-name-index.aspx

 
Regards,
Bozhidar
Telerik

[Ed]

Thank you, that worked.
Sorry that I did not find that post in my search for a solution.