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The csharp code you'll be racing to type out is all about:
A csv file stands for a Comma-separated-values file. It will open as a spreadsheet (often in Excel) with lots of data organised into rows and columns.
When you open the csv file in a text editor (like notepad), the value for each cell is separated by a comma. Each row is written on a new line.
This example writes the 3 times table to a file called "timestables.csv":