Parameters & Returns in C#

// Pass by value (default)
void ChangeValue(int x)
{
    x = 100;  // Doesn't affect original
}

// Pass by reference
void ChangeRef(ref int x)
{
    x = 100;  // Changes original
}

// Out parameters (must assign)
bool TryParse(string input, out int result)
{
    return int.TryParse(input, out result);
}

// Multiple returns with tuples
(int sum, int product) Calculate(int a, int b)
{
    return (a + b, a * b);
}

// Named arguments
PrintInfo(age: 25, name: "Bob");