You mention it's hard to see what it does: that's because it adds spaces and those are difficult to see in the console. Try adding a character directly before and after the output so you can more clearly see the space, like the examples below:
This
Console.WriteLine("[{0, -25}]", "Microsoft"); // Left aligned
Console.WriteLine("[{0, 25}]", "Microsoft"); // Right aligned
Console.WriteLine("[{0, 5}]", "Microsoft"); // Ignored, Microsoft is longer than 5 chars
Will result in this (with spaces)
[Microsoft ]
[ Microsoft]
[Microsoft]
Which looks like this in the console window:
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