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Compiler Error CS0186 

Error Message

Use of null is not valid in this context

The following sample generates CS0186:

// CS0186.cs
using System;
using System.Collections;

class MyClass 
{
   static void Main() 
   {
      // Each of the following lines generates CS0186:
      foreach (int i in null) {}   // CS0186
      foreach (int i in (IEnumerable) null) { };   // CS0186
   }
}
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