! Operator
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! Operator (C# Reference)

The logical negation operator (!) is a unary operator that negates its operand. It is defined for bool and returns true if and only if its operand is false.

User-defined types can overload the ! operator (see operator).

// cs_operator_negation.cs
using System;
class MainClass 
{
    static void Main() 
{
        Console.WriteLine(!true);
        Console.WriteLine(!false);
    }
}

 
False
True
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