This sticky thread lists known issues and breaking changes introduced in the UI for ASP.NET AJAX releases.
Q3 2011 (Version number: 2011.3.1115)
Problem: When adding items to OData-enabled controls (RadMenu, RadTreeView, RadListBox, RadComboBox) through design time erroneous markup is applied to the control:
<telerik:RadListBox runat="server" ID="RadListBox1">
<Items>
</Items>
<WebServiceSettings>
<ODataSettings InitialContainerName="">
</ODataSettings>
</WebServiceSettings>
</telerik:RadListBox>
Please note the added ODataSettings section. It will cause JavaScript errors on the page.
Solution: Remove the ODataSetting section and the issue will vanish. The problem is also fixed in the Q3 SP1 release, version number 2011.3.1305When I run my project I'm getting this error
Could not load file or assembly 'Telerik.Web.UI' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
In my web.config I checked that the version in the web.config is the same as the version I'm using in references
<assemblyIdentity name="Telerik.Web.UI" publicKeyToken="121fae78165ba3d4" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-2020.2.617.45" newVersion="2020.2.617.45" />