So I really think that the version I want to use is not the one which is used.
VKVinish Kumar K Syncfusion Team September 27, 2013 03:58 AM UTC
It seems, Syncfusion.Core is not there in either GAC (if you set the Assembly Reference as CopyLocal=False) or in Bin or local folder where you referred from(If you set the Assembly Reference as CopyLocal=True). Please make sure this and re-compile your project, it should work for you.
If you still face the issue, please provide more information about the issue and send me your project file (csproj) alone. Please let me know if you have any queries.