C# Passing same variable to two "out" parameters

Question

Is it normal that 'user1' and 'user2' point to the same reference in the example below?

I know that I am passing the same variable 'notUsed' to both parameters, but it's not yet instanced so it does't contain a reference to anything. I was quite shocked to see that user1 and user2 are linked to each other.

static void CheckPasswords(out string user1, out string user2)
{
    user1 = "A";
    user2 = "B";

    Console.WriteLine("user1: " + user1);
    Console.WriteLine("user2: " + user2);
}

public static void Main()
{
    string notUsed;
    CheckPasswords(out notUsed, out notUsed);
}

Console shows:

user1: B
user2: B

Answer 1

When you use the out keyword, you pass by reference. (https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/out-parameter-modifier) Since you are passing by reference, your user1 and user2 are both pointing to the same variable. Hence, when you update one, it updates the other.