I have a working C#Vs .Net program I try to create a chart control using office web components but i encounter an exxception during intialization time and when form containing office web component got focus. Exception is Exception is ' A first chance of Exception of type System.Runtime.InteropService.ComException occured in System.Windows.Forms.dll and additional message is Unknown Error This exception is seen only when Exception options is enabled in the debugger I think this exception is automatically handled by the system and is not thrown out explicitly.but i want to overcome this excpetion and need to known the reason for this exception sorry for the long mesage, hope that one of you can help me to solve my problem greets raji