C# Error CS1599 – The return type of a method, delegate, or function pointer cannot be ‘{0}’

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C# Error

CS1599 – The return type of a method, delegate, or function pointer cannot be ‘{0}’

Reason for the Error & Solution

Method or delegate cannot return type ‘type’

Some types in the .NET class library, for example, , and cannot be used as return types because they can potentially be used to perform unsafe operations.

The following sample generates CS1599:

// CS1599.cs  
using System;  
  
class MyClass  
{  
   public static void Main()  
   {  
   }  
  
   public TypedReference Test1()   // CS1599  
   {  
      return null;  
   }  
  
   public ArgIterator Test2()   // CS1599  
   {  
      return null;  
   }  
}
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