<p>I am trying to use a class from a C# assembly in vb.net. The class has ambiguous members because vb.net is case insensitive. The class is something like this:</p>

<pre>
public class Foo {

  public enum FORMAT {ONE, TWO, THREE};

  public FORMAT Format {
    get {...}
    set {...}
   }
}
</pre>

<p>I try to access the enum: Foo.FORMAT.ONE</p>

<p>This is not possible because there is also a property named 'format'.</p>

<p>I can not change the C# assembly. How can I get around this and reference the enum from vb.net?</p>

I don't think you can get around this. Get in touch with the author of the C# component you are trying to use and convince them to fix their code.
Incidentally, this is the primary reason behind the
```
CLSCompliant(true)
```
attribute, which if you are writing APIs or other code that has a high probability of being used by other languages you should always set. It would have flagged this issue for the original author to be aware of and fix correctly.