using System;

public class Program

{

    public static void Main()

    {

        string s1 = "hi, everyone ,we are working in a c# language, in a new platform";

        Console.WriteLine(TextTool.CountStringOccurrences(s1, "Sam"));

        Console.WriteLine(TextTool.CountStringOccurrences(s1, "in"));

        const char Space = ' ' ;

        const char Comma = ',';

        char[] delimiters = new Char[]

        {

            Space,

            Comma

        };

        string output = "";

        int ctr = 1;

        foreach(string subString in s1.Split(delimiters))

        {

            output += ctr++;

            output += ":";

            output += subString;

            output += "\n";

    }

        Console.WriteLine(output);

    }

}

public static class TextTool

{

    public static int CountStringOccurrences(string text, string pattern)

    {

    int count = 0;

    int i = 0;

    while ((i = text.IndexOf(pattern, i)) != -1)

    {

        i += pattern.Length;

        count++;

    }

    return count;

    }

}

​