Compiler Warning (level 1) CS1690

Accessing a member on 'member' may cause a runtime exception because it is a field of a marshal-by-reference class

This warning occurs when you try to call a method, property, or indexer on a member of a class that derives from MarshalByRefObject, and the member is a value type. Objects that inherit from MarshalByRefObject are typically intended to be marshaled by reference across an application domain. If any code ever attempts to directly access the value-type member of such an object across an application domain, a runtime exception will occur. To resolve the warning, first copy the member into a local variable and call the method on that variable.

The following sample generates CS1690:

// CS1690.cs  
using System;  
class WarningCS1690: MarshalByRefObject  
   int i = 5;  
   public static void Main()   
     WarningCS1690 e = new WarningCS1690();  
     e.i.ToString();   // CS1690  
     // OK  
     int i = e.i;  
     e.i = i;