How to split the textbox values

static void Main(string[] args)
        {
            List<string> sourceFromDB = new List<string> 
            { 
                "chennai, mumbai, pune"
                ,"chennai, mumbai"
                ,"chennai, bangalore"
                ,"bangalore, pune"
                ,"delhi, pune"
                ,"chennai"
                ,"mummbai"
                ,"chennai"
            };

            string text = "chennai,mummbai";

            // Start.  Maybe the follow code is what you need.^_^
            string[] allKey = (text ?? "").Split(new char[] { ',', ' ' }, StringSplitOptions.RemoveEmptyEntries);
            List<string> result = (from sc in sourceFromDB
                                   let scTp = sc.Split(new char[]{',',' '},StringSplitOptions.RemoveEmptyEntries)
                                   where scTp.Distinct().Intersect(allKey).Count() > 0
                                   select sc).ToList();
            // End. 

            foreach (string str in result)
            {
                Console.WriteLine(str);
            }
            Console.ReadKey();
        }</string></string></string>