Streamwriter output doesnt work Any Idea?

Question

public void EditorialResponse(string filename, string word, string replace, string newfile)

{

StreamReader reader = new StreamReader("C\\:MyFile\\Story");

string input = reader.ReadToEnd();

using (StreamWriter writer = new StreamWriter("C\\:MyFile\\Story1", true)

{

string output = input.Replace("lol", "lel");

writer.Write(output);

writer.Close();

}

}