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<= Operator (C# Reference)
All numeric and enumeration types define a "less than or equal" relational operator (<=) that returns true if the first operand is less than or equal to the second, false otherwise.
User-defined types can overload the <= operator. For more information, see operator. If <= is overloaded, >= must also be overloaded. Operations on integral types are generally allowed on enumeration.
static void Main()
Console.WriteLine(1 <= 1.1);
Console.WriteLine(1.1 <= 1.1);