How do you check if a string exist in a constant
<p>Please don't tell me to use enum instead.  How do I check if "testStr" is in the struct "Supplier"?</p>

<pre><code>public struct Supplier {
    public const string
        NA = "N/A",
        companyA = "companyA",
        companyB = "companyB";
}

string testStr = "companyA";
</code></pre>
