ASCII char to hexa value in C#

Question

How to convert ASCII char values example 'a' to its eqvelent hexa value 41 ?

Answer 1

Convert to int then to hex

Convert.ToInt32('a').ToString("X");

a is actually 61, and A is 41

Answer 2

C# has a built in function to convert to byte : Convert.ToByte('a')

Answer 3

String.Format("{0:X}", Convert.ToInt32(letter));