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c# - How to pad a binary string with zeros?

string binary = Convert.ToString(15, 2);

Console.WriteLine("{0}", binary);

Prints:

1111

I want it to print 00001000

Because the data type is of string and not integer I cannot do something like this:

Console.WriteLine("{0:00000000}", binary);
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Console.WriteLine( binary.PadLeft(8, '0'));

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