What is the meaning of ToString X2

Question

I m studying MD5 encryption  and have found this code using Google       public string CalculateMD5Hash string input                    Primeiro passo  calcular o MD5 hash a partir da string         MD5 md5   System Security Cryptography MD5 Create            byte   inputBytes   System Text Encoding ASCII GetBytes input           byte   hash   md5 ComputeHash inputBytes               Segundo passo  converter o array de bytes em uma string haxadecimal         StringBuilder sb   new StringBuilder            for  int i   0  i  lt  hash Length  i                          sb Append hash i  ToString  X2                       return sb ToString            Why does it use ToString  X2    How is it different from normal ToString

User · Accepted Answer

It formats the string as two uppercase hexadecimal characters.

In more depth, the argument "X2" is a "format string" that tells the ToString() method how it should format the string. In this case, "X2" indicates the string should be formatted in Hexadecimal.

byte.ToString() without any arguments returns the number in its natural decimal representation, with no padding.

Microsoft documents the standard numeric format strings which generally work with all primitive numeric types' ToString() methods. This same pattern is used for other types as well: for example, standard date/time format strings can be used with DateTime.ToString().

User · Answer

ToString  X2   prints the input in Hexadecimal

User · Answer

It prints the byte in Hexadecimal format   No format string            13  X2  format string          0D  http   msdn microsoft com en-us library aa311428 v vs 71  aspx

[c#] What is the meaning of ToString("X2")?

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