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Compiler Error CS1018

Keyword this or base expected

The compiler encountered an incomplete constructor declaration.

The following sample generates CS1018 and suggests several ways to resolve the error:

// CS1018.cs
namespace x
{
   public class C
   {
   }

   public class a : C
   {
      public a(int i)
      {
      }

      public a () :   // CS1018
      // possible resolutions:
      // public a () resolves by removing the colon
      // public a () : base() calls C's default constructor
      // public a () : this(1) calls the assignment constructor of class a
      {
      }

      public static int Main()
      {
         return 1;
      }
   }
}
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