using System;

using System.Text.RegularExpressions;

​

public class Example

{

    public static void Main()

    {

        string input = @"aasaas; ;;asas";

        RegexOptions options = RegexOptions.Multiline;

        foreach (string line in input.Split(';', System.StringSplitOptions.RemoveEmptyEntries | System.StringSplitOptions.TrimEntries))

        {

            Console.WriteLine(line);

        }

    }

}

​