using System;

public class Program

{

    public static void Main() {

        string[] delimiterStrings = new []{ ":1," };

​

​

​

        string text = "621:1,622:1,623:1,624:1,";

​

        string[] words = text.Split(delimiterStrings, StringSplitOptions.RemoveEmptyEntries);

        System.Console.WriteLine("{0} words in text:", words.Length); 

​

        string save  = "";

        foreach (string s in words)

        {                 

             System.Console.WriteLine(s);

        }

    }

}