string input = "Hello World!"; char[] values = input.ToCharArray(); foreach (char letter in values) { // Get the integral value of the character. int value = Convert.ToInt32(letter); // Convert the integer value to a hexadecimal value in string form. Console.WriteLine($"Hexadecimal value of {letter} is {value:X}"); } /* Output: Hexadecimal value of H is 48 Hexadecimal value of e is 65 Hexadecimal value of l is 6C Hexadecimal value of l is 6C Hexadecimal value of o is 6F Hexadecimal value of is 20 Hexadecimal value of W is 57 Hexadecimal value of o is 6F Hexadecimal value of r is 72 Hexadecimal value of l is 6C Hexadecimal value of d is 64 Hexadecimal value of ! is 21 */