title: Override attribute in partial class
body: <p>I have class autogenerated by tool:</p>
  
  <pre><code>[SomeAttribute(1)]
  public partial class A
  {
     ...
  }
  </code></pre>
  
  <p>I need to change attribute, but if I put in other file:</p>
  
  <pre><code>[SomeAttribute(2)]
  public partial class A
  {
     ...
  }
  </code></pre>
  
  <p>I get an error:</p>
  
  <blockquote>
    <p>Duplicate 'SomeAttribute' attribute.</p>
  </blockquote>
  
  <p>Is there a way to override the attribute in partial class?
  Some hack? </p>