Int to string conversion with leading 0s

Question

I currently convert an integer to a string for display to the screen, but wish to maintain 4 digits - i.e 10 = "0010". What is the best way of going from an integer of 10 to a string of "0010"?

This is in C# and .NET 4.

Cheers!

Answer 1

int num = 1;
// pad with 0 up to 4 places
string str = num.ToString("D4");

Answer 2

var str = 10.ToString("0000");

Answer 3

You can try :-

 string str = num.ToString("D8"); //padding with 8 zero's

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