After running sample application for version 2011.2 (C:\Users\Public\Documents\Infragistics\NetAdvantage 2011.2\ASP.NET\Startup Solution) it could not find some of the assemblies and throws an exception.
<add assembly="Infragistics35.WebUI.UltraWebGrid.ExcelExport.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.UltraWebGrid.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.UltraWebListbar.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.UltraWebNavigator.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.UltraWebTab.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.UltraWebToolbar.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.WebCombo.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.WebDataInput.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.WebDateChooser.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.WebNavBar.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.WebSchedule.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.WebScheduleDataProvider.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.WebSpellChecker.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.WebHtmlEditor.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.UltraWebGrid.DocumentExport.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
<add assembly="Infragistics35.WebUI.WebResizingExtender.v11.2, Version=11.2.20112.1019, Culture=neutral, PublicKeyToken=7DD5C3163F2CD0CB"/>
This errors are thrown because Startup Solution application contains pages that referred the old classic controls which were retired. This issue is reported and we are working to resolve this.