.NET String Helper Functions

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace IDS.Rapport.Dell.Helpers
{
    class StringHelper
    {
        public static string Between(string Text, string FirstString, string LastString)
        {
            string STR = Text;
            string STRFirst = FirstString;
            string STRLast = LastString;
            string FinalString;

            int Pos1 = STR.IndexOf(FirstString) + FirstString.Length;
            int Pos2 = STR.IndexOf(LastString);
            FinalString = STR.Substring(Pos1, Pos2 - Pos1);
            return FinalString;
        }

    }
}

Calling these functions

1. Between

ResponseText = StringHelper.Between(ResponseText,FirstString,LastString);