C# random - if statement only output = -1

Question

I'm trying to make my program output either 1 or -1 this is my code so far and its only output is -1. It's not random at all.

Random rnd = new Random();
int L = rnd.Next(0, 1);
if (L == 0)
{
    Console.WriteLine(-1);
}
else
{
    Console.WriteLine(1);
}

Answer 1

The second argument Random.Next(int, int) gives an exclusive upper bound. So you're saying you want an integer greater than or equal to 0, and less than 1. That doesn't give a lot of scope for numbers other than 0 :)

From the documentation:

Return Value
Type: System.Int32
A 32-bit signed integer greater than or equal to minValue and less than maxValue; that is, the range of return values includes minValue but not maxValue. If minValue equals maxValue, minValue is returned.

You should also read my article on randomness to avoid other common problems.