Hi, Thanks for promp reply.
I found out what the problem for this 500 error. Actually while filtering with date column in grid there are some columns which contains null values. So due to this that error is showing.
I am not sure if this is bug in your control or you have fixed it in new versions. If yes then please let me know which is your latest version. Latest version for controls I found on your site is Version=2008.3.1105.35, which is I am using currently.
Please let me asap.