title: How to find and replace text in a file
body: <p>My code so far</p>
  
  <pre><code>StreamReader reading = File.OpenText("test.txt");
  string str;
  while ((str = reading.ReadLine())!=null)
  {
        if (str.Contains("some text"))
        {
            StreamWriter write = new StreamWriter("test.txt");
        }
  }
  </code></pre>
  
  <p>I know how to find the text, but I have no idea on how to replace the text in the file with my own.</p>