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?（）

单项选择题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 .coms 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?（）

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单项选择题You work as an application developer at Certkiller .com. You are currently in the process of creating a new application for Certkiller .com. You are required to read compressed data files that has been sent by Certkiller .coms sales offices. These data files are less than 4 GB in size, but was compressed without cyclic redundancy. You want to write a method that receives the compressed files and return the uncompressed data as a byte array. What should you do?（）

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单项选择题You are in the process of creating a new application. This new application has to be able to read all data from a text file. What should you do?（）

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单项选择题You are currently in the process of creating an application that reads binary information from a file. You need to ensure that the only the first kilobyte of data is retrieved. What should you do?（）

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单项选择题You have recently completed the creation of a new application. Certkiller .com requires you to ensure that this new application creates a file that contains an array of bytes. What should you do?（）

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