Compiler Error CS1027

#endif directive expected

A matching #endif preprocessor directive was not found for a specified #if directive. Or, the compiler may have found a #endregion directive when there was no matching #region directive inside a #if block.

The following sample generates CS1027:

// CS1027.cs  
#if true   // CS1027, uncomment next line to resolve  
// #endif  
  
namespace x  
{  
   public class clx  
   {  
      public static void Main()  
      {  
      }  
   }  
}