title: how do i remove a string from another string in c# unity
body: <p>I have two strings (text) and (a). I want to remove (a) from (text) after an if statement
  this is what I have</p>
  <pre><code>public string text; 
  public string a = 'a';
  
  void Update(){
       if(text.Contains('a')){
          text - a;
       }
  }
  </code></pre>
  <p>but I get error with this that I cannot use - how do I remove it</p>