using System;
using System.Linq;
using System.Collections.Generic;
using System.Globalization;
using System.Net;

static class Extensions{
    public static bool ContainsMoreThan(this string text, int count, string value,  StringComparison comparison)
    {
        if (text == null) throw new ArgumentNullException("text");
        if (string.IsNullOrEmpty(value))
            return text != "";
    
        int contains = 0;
        int index = 0;
    
        while ((index = text.IndexOf(value, index, text.Length - index, comparison)) != -1)
        {
            if (++contains > count)
                return true;
            index++;
        }
        return false;
    }
}

public class Test
{
	public static void Main()
	{
            string text = "Lorem ipsum dolor sit amet, quo porro homero dolorem eu, facilisi inciderint ius in.";
            bool containsMoreThanOnce = text.ContainsMoreThan(1, "dolor", StringComparison.OrdinalIgnoreCase);
            Console.WriteLine("Contains more than once? " + containsMoreThanOnce);
	}   
}