Console.WriteLine as hexadecimal

int i=10;

Console.WriteLine("{0:x}", i);

or if you want 'A':

int i=10;

Console.WriteLine("{0:X}", i);

i.ToString("x");

Console.WriteLine ("Hex: {0:X}", nNum);

The X formatter outputs uppercase hex chars. Use a lowercase x for lowercase hex chars.

int i=10;
Console.WriteLine("{0:X4}", i);

Outputs hex with a size specifier.

you can also use string interpolation

int i=10;
Console.WriteLine($"{i:X4}");

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