Compiler Error CS0713

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Static class 'static type' cannot derive from type 'type'. Static classes must derive from object.

If this were allowed, the static class would inherit methods and non-static members from the base class, so it would not be static. Therefore, it is not allowed.

The following sample generates CS0713:

// CS0713.cs
public class Base
{
}

public static class Derived : Base  // CS0713
{
}

public class CMain
{
   public static void Main()
   {
   }
}