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Convert int to string with leading zeros in C#

There are multiple ways to convert int to string with leading zeros in C#, below 4 examples:

using System;

public class Program
{
	public static void Main()
	{
		int i = 10;
		string newStr = "";
		newStr = i.ToString().PadLeft(4, '0'); // doesn't work for negative numbers
		Console.WriteLine(newStr);
		
		i = 20;
		newStr = "";
		newStr = i.ToString("0000"); // explicit form
		Console.WriteLine(newStr);
		
		i = 30;
		newStr = "";
		newStr = i.ToString("D4"); // short form format specifier
		Console.WriteLine(newStr);
		
		i = 40;
		newStr = "";
		newStr = $"{i:0000}"; // string interpolation (C# 6.0+)
		Console.WriteLine(newStr);		
	}
}

Output

0010
0020
0030
0040

Conclusion

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