title: Attributes and classes
body: <p>I'm searching to how can I know inside an attribute definition if the class I apply the attribute to, has another attribute<br>
  Example:  </p>
  
  <pre><code>[My1Attribute]  
  public class MyClass  
  {   
      [My2Attribute]  
      int aux{get;set;}  
  
  }        
  
  internal sealed class My1Attribute : Attribute
  { 
       public My1Attribute
       {
             // How can  I Know if 'MyClass' has My2Attribute applied ???
       }
  }
  </code></pre>