input in text for chrome and under framework4.5

public static void Main(string[] args)
{
    string[] lines = System.IO.File.ReadAllLines(@"C:\Users\jieun\Desktop\test.txt");
    List<string> mylist = new List<string>();
    foreach(string line in lines)
    {
        mylist.Add(line);
    }
    string myString = String.Join(",", mylist);
    Console.WriteLine(myString);
}