Applicatin is closing automatically without throwing any exception.

For logging information I am using .txt file.
I am looging the .csv file name(raw file), how many rows has been imported in .xls files and some more addition information which is available in .csv file.

For example:
This is thing which tool is logging for each .csv file

Importing DTC Report: CSV FILE NAME
Number of Zero occurrence count - 0 12:25:26 AM (Additional information which is available in raw files)
Number of duplicate codes - 17 12:25:27 AM (Additional information which is available in raw files)
Number of codes are not imported due to unavailability of MID: 2751 (Additional information which is available in raw files)
Importing DTC report completed 12:29:48 AM
Total codes imported - 243480 12:29:48 AM (Number of rows imported)
*Codes = Rows

I am waiting for your reply