Hi 
I am using the kentico version 2.3, i have downloaded the source code and database to local to upgrade the kentico version, but when i check the image gallery section i got the error 
[Error loading the WebPart 'ImageGallery'] 
c:\mydrive\euclidmanagers\CMSWebParts\Viewers\ImageGallery.ascx.cs(309): error CS0104: 'DataPager' is an ambiguous reference between 'System.Web.UI.WebControls.DataPager' and 'CMS.Controls.DataPager' 
The above error is occurred before upgrading the CMS, but it works fine in production 
Any help will be appreciated 
Regards
Dhanraj