C# Method Overloading

Method overloading lets you define multiple methods with the same name but different parameter lists — the compiler picks the right one at compile time.

1 - Basic Overloading

public static class MathHelper
{
    public static int Add(int a, int b)           => a + b;
    public static double Add(double a, double b)  => a + b;
    public static int Add(int a, int b, int c)    => a + b + c;
}

Console.WriteLine(MathHelper.Add(1, 2));        // 3
Console.WriteLine(MathHelper.Add(1.5, 2.5));    // 4.0
Console.WriteLine(MathHelper.Add(1, 2, 3));     // 6

2 - Overloading with Different Types

public static void Print(int value)    => Console.WriteLine($"int: {value}");
public static void Print(double value) => Console.WriteLine($"double: {value}");
public static void Print(string value) => Console.WriteLine($"string: {value}");

Print(42);      // int: 42
Print(3.14);    // double: 3.14
Print("hello"); // string: hello

3 - Constructor Overloading

class Rectangle
{
    public double Width  { get; }
    public double Height { get; }

    public Rectangle(double side) : this(side, side) { }

    public Rectangle(double width, double height)
    {
        Width  = width;
        Height = height;
    }

    public double Area() => Width * Height;
}

var square = new Rectangle(5);
var rect   = new Rectangle(4, 6);
Console.WriteLine(square.Area()); // 25
Console.WriteLine(rect.Area());   // 24