Generate random alphanumerals with c#

random.cs

public string randomID(int length = 5)
{
	const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

	var random = new Random();
	var randomString = new string(Enumerable.Repeat(chars, length).Select(s => s[random.Next(s.Length)]).ToArray());
	return randomString;

}