...is inaccessible due to its protection level c#/asp.net

Question

I have an application with a separate class, that i'm instantiating in the code behind-file (in Page_Load). In the class there's some methods that I want to be able to call from the code behind-file, but by some reason it doesn't work (SecretNumber.MakeGuess(int) is inaccessible due to it's protection level). The class as well as the methods are public so what can be the reason?

// Default.asx.cs

...

protected void btnCheckNr_Click(object sender, EventArgs e)
{
    if (!Page.IsValid){
        return;
    }

    else{
        var guessedNr = int.Parse(inputBox.Text);
        var result = SecretNumber.MakeGuess(guessedNr); <- inaccessible due to...
    }
}

// SecretNumber.cs

public class SecretNumber {

    enum Outcome {
        Indefinite,
        Low,
        High,
        Correct,
        NoMoreGuesses,
        PreviousGuess
    };

    // Other code goes here...

    public Outcome MakeGuess(int guess) {
        // Other code here
    }
}

Answer 1

It is because your Outcome enumeration is private. Also in the code you have, MakeGuess needs to be marked as static to be used the way you have it written.