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The application requests real time USA stocks prices from Google finance every N minutes (N is selectable by user) and compares the prices with previously requested ones to count volatility. Every request results are saved to database for further analysis.Before this application development I had made JSON response parser to get all USA stocks list from this Google finance page finance.google.com/finance/stockscreener and saved it to SQL Express database. Then I had wrote the JSON parser to get current real time USA stocks prices from Google finance free service and method to count volatility values.