I am trying to make a practice username and password validation form

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Windows

application

C#5.0

form

, +

I want to compare the username and password entered up against two arrays one for the username and one for the password. That hasn't work. Also, I have tried using a dictionary but no luck with that.

namespace PracticeLogin
{
    public partial class PasswordPracticeForm : Form
    {
       /* Dictionary<string, string> Credentials = new Dictionary<string, string>
        {
            {"joseph", "password1"},
            ("william", "password2"),
        };*/ //initially tried the above to test the input user and pass against

        /* also tried the following
         * var[] userArr = { "joseph", "william" };
         * var[] passArr = {"password1", password2"};
         * */
        static private Authenticator auth = new Authenticator();

        public PasswordPracticeForm()
        {
            InitializeComponent();

            InitializeMyControl(); //see line 53-63

        }



        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {


            var username = txtBoxUserName.ToString();
            var password = txtPassword.ToString();

            var isvalid = auth.ValidateCredentials(username, password);
            if (isvalid)
            {
                MessageBox.Show("You are authenticated!");
            }
            else
                MessageBox.Show("invalid login information!");

        }

        private void InitializeMyControl() // refer to line 25. this is supposed to make each character of the password display as and asterisk. 
            //instead only shows asterisk in first spot then just shows every character of  the pass instead. retrieved this code from 
        //https://msdn.microsoft.com/en-us/library/aa983584(v=vs.71).aspx but it was not clear on where to put it.  
        {
            //set to no text.
            txtPassword.Text = "";
            //set password characters as asterisk
            txtPassword.Text = "*";
            //password length

            txtPassword.MaxLength = 25;

        }


    }
}
class Authenticator
{
    private Dictionary<string, string> Credentials = new Dictionary<string, string>();
    public Authenticator()
    {
        //username and password
        Credentials.Add("joseph", "password1");
        Credentials.Add("williams", "password");
    }

    public bool ValidateCredentials(string username, string password)
    {
        return Credentials.Any(entry => entry.Key == username && entry.Value == password);
    }
}

What I have tried:

I have tried different things I have found doing searches on google and other sites such as MSDN, Stackoverflow, Here, a few others and still no luck.

Thank you for you help.

Also, this is not related to school work or any job related task. I am a disabled Navy veteran and just trying to think of different things to do to gain more experience. The last course I took on C# was in 2014. It will be about a year before I am able to take any more.

Thank you again.