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Compiler Warning (level 1) CS1633 

Error Message

Unrecognized #pragma directive

The pragma used was not one of the known pragmas supported by the C# compiler. To resolve this error, use only pragmas supported.

The following sample generates CS1633:

// CS1633.cs
// compile with: /W:1
#pragma unknown  // CS1633

class C
   public static void Main()