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Compiler Error CS0506

'function1' : cannot override inherited member 'function2' because it is not marked "virtual", "abstract", or "override"

A method was overridden that was not explicitly marked as virtual, abstract, or override.

The following sample generates CS0506:

// CS0506.cs
namespace MyNameSpace
{
   abstract public class ClassX
   {
      public int i = 0;

      public int f()
      {
         return 0;
      }
      // Try the following definition for f() instead:
      // abstract public int f();
   }

   public class ClassY : ClassX
   {
      public override int f()   // CS0506
      {
         return 0;
      }

      public static int Main()
      {
         return 0;
      }
   }
}

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