Compiler Error CS0678

'variable': a field can not be both volatile and readonly

Use of the volatile and readonly keywords is mutually exclusive.

The following sample generates CS0678:

// CS0678.cs
using System;

class TestClass
{
   private readonly volatile int i;   // CS0678
   // try the following line instead
   // private volatile int i;

   public static void Main()
   {
   }
}