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using System;
 
namespace Articulos.Ch03
{
    public class ClaseBase
    {
        public int X;
        public ClaseBase (int x)
        {
            this.X = x;
        }
    }
 
    public class Subclase : ClaseBase
    {
        // Implementación clase
 
        public static void Main()
        {
            // Produce error CS1729 (Articulos.Ch03.ClaseBase' 
            // does not contain a constructor that takes 0 arguments):
            // ClaseBase cb = new ClaseBase(123);
        }
    }
}

prog.cs(14,18): error CS1729: The type `Articulos.Ch03.ClaseBase' does not contain a constructor that takes `0' arguments
prog.cs(8,16): (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings

Standard output is empty