Compiler Error CS0504

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The constant 'variable' cannot be marked static

If a variable is const, it is also static. If you want a const and static variable, just declare that variable as const; if all you want is a static variable, just mark it static.

The following sample generates CS0504:

// CS0504.cs
namespace x
{
   abstract public class clx
   {
      static const int i = 0;   // CS0504, cannot be both static and const
      abstract public void f();
   }
}