public CustomOAuthProvider(CustomProviderOptions options)
 {
     if (options == null)
     {
         throw new ArgumentNullException("options");
     }
     _options = options;
 }
 public CustomOAuthProvider(CustomProviderOptions options)
 {
     if (options == null)
     {
         throw new ArgumentNullException("options");
     }
     _options = options;
 }