title: Implementing strings and the OR function (||) in an if statement
body: <p>I am currently trying to make an if statement to validate a string. This is currently what I have.</p>
  
  <pre><code>Console.Write("Please enter your phone number: ");
  string input = Console.ReadLine();
  
  if (input.Length &lt; 9)
  {
      Console.WriteLine("Phone number is not valid, please try again.");
  }
  
  string everythingButThePlus = input.Substring(1);
  string justThePlus = input.Substring(0, 1);
  
  if (justThePlus = "+" || "1" || "2" || "3" || "4" || "5" || "6" || "7" || "8" || "9" || "0") ;
  {
  
  }
  Console.ReadLine();
  </code></pre>
  
  <p>The portion, "justThePlus = "+" ||" is currently got a red underline with the description being, </p>
  
  <blockquote>
    <p>"Operator '||' cannot be applied to operands of type 'string' and
    'string'.</p>
  </blockquote>
  
  <p>If I can't use OR statements, what is an alternative that works with strings?  </p>