NGWS SDK Documentation  

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Compiler Error CS0180

'member' cannot be both external and abstract

abstract and extern are mutually exclusive. extern means that the member is defined outside the file, and abstract means that the implementation is provided in a derived class.

The following sample generates CS0180:

namespace x
{
   public class iii
   {
      public extern abstract int aaa(int aa);   // CS0180
      public static void Main()
      {
      }
   }

}