title: if statement for throwing Exception?
body: <p>Hi I wanted to ask because I'm not sure if is it propriete using of Exception:</p>
  
  <pre><code>public int Method(int a, int b) {
     if(a&lt;b) throw new ArgumentException("the first argument cannot be less than the second");
     //do stuff... 
  }
  </code></pre>
  
  <p>can I throw Exception after if statement? or should I always use try - catch when it goes with the exceptions?</p>