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You define the following regular expression of currency values:
regex tx = new regex("^-?\d+(\.\d{2})?$")
You are required to write code that will be used to find whether a string in the variable named Bill matches the regular expression or not. You are also required to use this code as the expression in a conditional statement and need to know which code segment to use.
What should you do?（）

Certkiller .com has a file server named Certkiller -SR07 that stores old inventory files. Certkiller .com has given you the task of creating an application to archive these old inventory files.
The inventory files have to be compressed prior to being uploaded to Certkiller .com's Web server.
You are currently writing a method that will receive a byte array and compress it into a new file.
You need to ensure that a data corruption check takes place during the decompression process.
What should you do?（）