ArgumentOutOfRangeException from Telerik.Web.UI.RadComboBox.PerformDataBinding()

[Song]

ArgumentOutOfRangeException from Telerik.Web.UI.RadComboBox.PerformDataBinding()

My project using RadComboBox control throws exception below. The exception occurs intermittently and randomly. That is, it happens for the same user some times.

Exception below:
1) Exception Information
*********************************************
Exception Type: System.ArgumentOutOfRangeException
Message: Selection out of range
Parameter name: value
Data: System.Collections.ListDictionaryInternal
TargetSite: Void PerformDataBinding(System.Collections.IEnumerable)
HelpLink:
Source: Telerik.Web.UI

StackTrace Information
*********************************************
   at Telerik.Web.UI.RadComboBox.PerformDataBinding(IEnumerable dataSource)
   at Telerik.Web.UI.RadComboBox.OnDataSourceViewSelectCallback(IEnumerable data)
   at System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback)
   at Telerik.Web.UI.RadComboBox.OnDataBinding(EventArgs e)
   at Telerik.Web.UI.RadComboBox.PerformSelect()
   at System.Web.UI.WebControls.BaseDataBoundControl.DataBind()
   at Telerik.Web.UI.RadComboBox.DataBind()
   at xxx.Default.Page_Load(Object sender, EventArgs e) in d:\xxx\Default.aspx.cs:line 34
   at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
   at System.Web.UI.Control.OnLoad(EventArgs e)
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   
Assembly Information:
    Assembly Telerik.Web.UI, Version=2014.3.1024.40, Culture=neutral, PublicKeyToken=121fae78165ba3d
    
Project Information:    
    ASP.NET, .NET 4.6

Telerik.Web.UI.RadComboBox Source code:
protected override void PerformDataBinding(IEnumerable dataSource)
    {
      base.PerformDataBinding(dataSource);
      if (!string.IsNullOrEmpty(this.cachedSelectedValue))
      {
        RadComboBoxItem itemByValue = this.FindItemByValue(this.cachedSelectedValue);
        if (itemByValue == null)
          throw new ArgumentOutOfRangeException("value", "Selection out of range");
        int num = this.Items.IndexOf(itemByValue);
        if (this.cachedSelectedIndex != -1 && this.cachedSelectedIndex != num)
          throw new ArgumentOutOfRangeException("value", "SelectedIndex and SelectedValue are mutually exclusive");
        this.SelectedIndex = num;
        this.cachedSelectedValue = (string) null;
        this.cachedSelectedIndex = -1;
      }
      else if (this.cachedSelectedIndex != -1)
      {
        this.SelectedIndex = this.cachedSelectedIndex;
        this.cachedSelectedIndex = -1;
      }
      this.UpdateFromCachedValueIndex();
    }   

Any idea to fix this?

[Veselin Tsvetanov]

Hi Songxun,

I would suggest you to move your custom logic that you currently have within the PerformDataBinding() method to the DataBound RadComboBox event handler.

Regards,
Veselin Tsvetanov
Telerik

[Song]

Hi Veselin,

That is source code from Telerik, not my code, as mentioned on the opening thread.

[Veselin Tsvetanov]

Hi Songxun,

This error reports that there was no item in the RadComboBox items collection, matching the saved (cached on on the postback) item. The reason for the above could be the fact that at the moment of setting the selected item, the RadComboBox items collection is still empty or it has the wrong items loaded. This could be caused even by slow / terminated internet connection. 

Regards,
Veselin Tsvetanov
Telerik

[Tarun]

Hi,

So, is there any way we can prevent it from occurring? Probably some check anywhere?