Compiler Error CS0663

Cannot define overloaded methods that differ only on ref and out.

Methods that differ only on their use of in, ref and out on a parameter are not allowed.

The following sample generates CS0663:

// CS0663.cs  
class TestClass  
{  
   public static void Main()  
   {  
   }  
  
   public void Test(ref int i)  
   {  
   }  
  
   public void Test(out int i)   // CS0663  
   {  
   }  
}