Generating unique ID with c#

In order to generate the IDs used in Youtube the following serves as an potential example. It uses the datetime class to generate ID which should be unique if the code runs on a single system.

	// A potential example to generating unique IDs as the youtube ID
	void Main()
	{
	long unixTimestamp = (long)(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1,0,0,0,0))).TotalSeconds;
	Console.WriteLine("EPOCH: {0}",unixTimestamp);
	long T = unixTimestamp;// DateTime.UtcNow.Ticks;
	Console.WriteLine("Current T: {0}",T);
	// Convert T to binary
	string binary = IntToString(T, new char[] { '0', '1' });
	Console.WriteLine("BinaryTick: {0}",binary);
	// Convert to hexadecimal
	string hex = IntToString(T, new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9','A', 'B', 'C', 'D', 'E', 'F'});
	Console.WriteLine("HexTick: {0}",hex);
	// Convert T to hexavigesimal (base 26, A-Z)
	string hexavigesimal = IntToString(T,
	Enumerable.Range('a', 26).Select(x => (char)x).ToArray());
	Console.WriteLine("HexavigesimalTick: {0}",hexavigesimal);
	// Convert T to sexagesimal
	string xx = IntToStringFast(T,
	new char[] { '0','1','2','3','4','5','6','7','8','9',
	'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
	'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x'});
	Console.WriteLine("SexagesimalTick: {0}",xx);
	}
	// Other methods and classes here
	public static string IntToString(long value, char[] baseChars)
	{
	string result = string.Empty;
	int targetBase = baseChars.Length;
	do
	{
	result = baseChars[value % targetBase] + result;
	value = value / targetBase;
	}
	while (value > 0);
	return result;
	}
	/// An optimized method using an array as buffer instead of string concatenation. This is faster for return values having a length > 1.
	public static string IntToStringFast(long value, char[] baseChars)
	{
	// 32 is the worst cast buffer size for base 2 and int.MaxValue
	int i = 32;
	char[] buffer = new char[i];
	int targetBase= baseChars.Length;
	do
	{
	buffer[--i] = baseChars[value % targetBase];
	value = value / targetBase;
	}
	while (value > 0);
	char[] result = new char[32 - i];
	Array.Copy(buffer, i, result, 0, 32 - i);
	return new string(result);
	}

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