Thank you for writing.
It seems that your question is related to an error raised when you build your sql command. If so, please note that the way you build up your data is not directly related to our controls, thus is falls out of the scope of our support services. Please address your question to the appropriate MSDN forums.
If you think that this is something related to our controls, please get back to us with a sample code allowing us to reproduce it, a sample data base and the exact steps that we should follow to replicate the experienced error on our end. Also, please confirm that you are using RadControls for WinForms.
the Telerik team