To reproduce: Download the attached files. One contains a project with TelerikDataAccess, the other one contains the SQL script to create the database. Before starting the project notice the column with header text "column1". You will see that its expression is as follows: "Player.Person.FirstName+\",\"+Player.Person.LastName". Starting the project at this point will not produce an exception. Change the name of the column to FirstName and start the project, you will see the stack overflow exception.