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Compiler Error CS0431 

Error Message

Cannot use alias 'identifier' with '::' since the alias references a type. Use '.' instead.

You used "::" with an alias that references a type. To resolve this error, use the "." operator.

The following sample generates CS0431:

// CS0431.cs
using A = Outer;

public class Outer 
{
   public class Inner 
   {
      public static void Meth() {}
   }
}

public class MyClass
{
   public static void Main()
   {
      A::Inner.Meth();   // CS0431
      A.Inner.Meth();   // OK
   }
}
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