title: Enum Extension Method is not showing
body: <p>I'm trying to add new/extension method for Enum but the extension method is not showing on intellisense method list. Please help here's my code.</p>
  
  <p><strong>Extension:</strong></p>
  
  <pre><code>public static class EnumExtensions
      {
          public static string GetDescriptionAttr(this Enum value,string key)
          {
              var type = value.GetType();
              var memInfo = type.GetMember(key);
              var attributes = memInfo[0].GetCustomAttributes(typeof(DescriptionAttribute),
                  false);
              var description = ((DescriptionAttribute)attributes[0]).Description;
              return description;
          }
      }
  </code></pre>
  
  <p><strong>Trying to call the result from other class (both caller and extension are in the same project)</strong></p>
  
  <p><img src="https://i.stack.imgur.com/xkLUz.png" alt="enter image description here"></p>