Console.WriteLine("\n--- Reverse ---\n");
string value = "abc123";
char[] valueArray = value.ToCharArray();
Array.Reverse(valueArray);
string result = new string(valueArray);
Console.WriteLine(result);

Console.WriteLine("\n--- Join ---\n");

result = String.Join(",", valueArray);
Console.WriteLine(result);

Console.WriteLine("\n--- Split ---\n");

string[] items = result.Split(',');
foreach (string item in items) {
    Console.WriteLine(item);
}