C# convert int to string with padding zeros?

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In C# I have an integer value which need to be convereted to string but it needs to add zeros before:

For Example:

int i = 1;

When I convert it to string it needs to become 0001

I need to know the syntax in C#.

14 s
14

i.ToString().PadLeft(4, '0') – okay, but doesn’t work for negative numbers
i.ToString("0000"); – explicit form
i.ToString("D4"); – short form format specifier
$"{i:0000}"; – string interpolation (C# 6.0+)

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