title: Using a string builder, i've read a file.. How do i find if the given string is present in the file or not?
body: <p>I've read a file into StringBuilder. 
  When I give a string as an input, if the word is present in the file, the output should be true.. If its not present, it should be false.. How do i do it? Could someone help me with the code? I've written the program till here.. How do i go further? Thanks alot.. :)</p>
  
  <pre><code>class Program
  {
      static void Main(string[] args)
      {
          using (StreamReader Reader = new StreamReader("C://myfile2.txt"))
          {
              StringBuilder Sb = new StringBuilder();
              Sb.Append(Reader.ReadToEnd());
              {
                  Console.WriteLine("The File is read");   
              }
          }
      }
  }
  </code></pre>