Error-com exception was unhandled

Error-com exception was unhandled

Hi support team,
while executing code in VSTA we came across the error.
I am attaching the snap of error.also the snap of referred code.
Please help if somebody have idea about the error.

This is a migrated post! Originally posted on 20.10.2014 by user jahidbagwan. Please be aware that information can be outdated.