C#

public int StringComparer(string stringA, string stringB)
{
    return stringA.CompareTo(stringB);
    // If the above doesn't do what you need then do what you like.
    // Must return -1, 0 or 1
}

string[] myStrings = { "123_456", "123_12", "123_123567" };
foreach (string s in myStrings)
    Console.WriteLine(s);

Console.WriteLine();

Array.Sort(myStrings);
foreach (string s in myStrings)
    Console.WriteLine(s);

Console.WriteLine();

var sortedRight = from s in myStrings.OfType<string>() 
                  orderby int.Parse(s.Split('_')[0]), int.Parse(s.Split('_')[1]) 
                  select s; 

foreach(string s in sortedRight)
    Console.WriteLine(s);

Console.ReadLine();

123_456
123_12
123_123567

123_12
123_123567
123_456

123_12
123_456
123_123567

V. wrote:

Can anybody point me out to a good tutorial?