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Compiler Error CS0023 

Error Message

Operator 'operator' cannot be applied to operand of type 'type'

An attempt was made to apply an operator to a variable whose type was not designed to work with the operator. For more information, see Data Types (C# Programming Guide) and C# Operators.

The following sample generates CS0023:

// CS0023.cs
namespace x
   public class a
      public static void Main()
         string s = "hello";
         s = -s;   // CS0023, minus operator not allowed on strings

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