Error message indicating that you using the wrong method signature.

The first day of the workshop went pretty well. After frontal explanation about design patterns and drill down to MVC 2 we create simple MVC 2 framework in order to get firm grasp of MVC II. As part of the MVC implementation we encourage a problem that drives me nuts. It seems that although we change assembly method signature we still receiving the old method signature. Nothing helps us … (copy the assembly to web bin directory, shutdown aspnet_wp, deleting temporary files, etc'). After smashing heads against the wall we found out that the naughty project simply missing checked compile check box in solution configuration manager (Build menu-> configuration manager), therefore simply didn’t compile!