AJAX Calendar/Scheduling Controls
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35"/>
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>
</dependentAssembly>
<assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35"/>
</assemblyBinding>
</runtime>
This issue will be fixed in 5.3 release. See also:
forums.daypilot.org/Topic.aspx/678/update_within_an_update_panel_does_not_work_vs_2008_and_net_
DayPilot for ASP.NET WebForms, DayPilot for ASP.NET MVC, DayPilot for Java