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 (see operator). If <= is overloaded, >= must also be overloaded.
using System; class Test { public static void Main() { Console.WriteLine(1 <= 1.1); Console.WriteLine(1.1 <= 1.1); } }
True True
C# Operators | CLR 7.9 Relational operators