Custom serial number key generator in C# .NET

I googled for sometime but i couldn't get what i want therefore i decided to write a Custom serial number generator class in C# .NET.

I try to figured out the method that return the following serial number format such as

SN = xxxx-xxxx-xxxx-xxxx-xxxx-xxxx

e.g : 85F7-1DF2-BB23-4C32-A684-C5D3

here's the one line of code :

string serialNumber =
RandomSNKGenerator.GetSerialKeyAlphaNumaric(SNKeyLength.SN16);

or if you want to generate random number only :

string serialNumberNumberOnly =
RandomSNKGenerator.GetSerialKeyNumaric(SNKeyNumLength.SN12);

Simple?

if you want to produce a complicated serial number key for your product, i think using
GetSerialKeyAlphaNumaric() method would be great. If you are very simple minded GetSerialKeyNumaric() still sufficient enough. :)


Here the class :

using System;
using System.Collections.Generic;
using
System.Text;

namespace SNGenerator
{
public enum
SNKeyLength
{
SN16 = 16, SN20 = 20, SN24 = 24, SN28 = 28, SN32 = 32
}
public enum SNKeyNumLength
{
SN4= 4 , SN8 = 8, SN12 =
12
}
public static class RandomSNKGenerator
{
private static string
AppendSpecifiedStr(int length, string str, char[] newKey)
{
string
newKeyStr = "";
int k = 0;
for (int i = 0; i < length; i++)
{
for
(k = i; k < 4 + i; k++)
{
newKeyStr += newKey[k];
}
if (k ==
length)
{
break;
}
else
{
i = (k) - 1;
newKeyStr +=
str;
}
}
return newKeyStr;
}
///

/// Generate
standard serial key with alphanumaric format
///

///
the supported length of the serial
key
/// returns formated serial
key
public static string GetSerialKeyAlphaNumaric(SNKeyLength
keyLength)
{
Guid newguid = Guid.NewGuid();
string randomStr =
newguid.ToString("N");
string tracStr = randomStr.Substring(0,
(int)keyLength);
tracStr = tracStr.ToUpper();
char[] newKey =
tracStr.ToCharArray();
string newSerialNumber = "";
switch (keyLength
)
{
case SNKeyLength.SN16:
newSerialNumber = AppendSpecifiedStr(16,
"-", newKey);
break;
case SNKeyLength.SN20:
newSerialNumber =
AppendSpecifiedStr(20, "-", newKey);
break;
case
SNKeyLength.SN24:
newSerialNumber = AppendSpecifiedStr(24, "-",
newKey);
break;
case SNKeyLength.SN28:
newSerialNumber =
AppendSpecifiedStr(28, "-", newKey);
break;
case
SNKeyLength.SN32:
newSerialNumber = AppendSpecifiedStr(32, "-",
newKey);
break;
}

return newSerialNumber;
}
///

/// Generate serial key with only numaric
///

/// the supported length of
the serial key
/// returns formated serial
key
public static string GetSerialKeyNumaric(SNKeyNumLength
keyLength)
{
Random rn = new Random();
double sd =
Math.Round(rn.NextDouble() * Math.Pow(10, (int)keyLength) + 4);
return
sd.ToString().Substring(0,(int)keyLength);
}
}
}

Good luck!