listing the values of an array in c#

Question

I have a Windows Form with two textboxes and two buttons. The textboxes are named txtVisited and txtAnswer. The buttons are Visited? and Exit. I want to input a city into the first textbox and have it check the array for a match. If there is a match, I want to display the text that it has been visited and it's position in the array. If it does not find a match, I want it to display the text "not visited." I have copied all the code I have so far. Any help would be much appreciated. I'm still really new to c# so I may or may not understand your answer. So bear with me. Sorry in advance.

    namespace Array
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void btnVisited_Click(object sender, EventArgs e)
        {
            string[] CityName = {"Columbus", "Bloomington", "Indianapolis",
                "Fort Wayne", "Greensburg", "Gary", "Chicago", "Atlanta", "Las Vegas"};
            bool visitedbool;
            int Subscript;
            string QueryCity;
            QueryCity = txtState.Text.ToUpper();
            int Subscript =0;
            visitedbool = false;

            while (visitedbool = true)

            if (CityName(intsubscript).ToUpper= QueryCity)
            {
                visitedbool = true
            }

            else
            { 
                Subscript =  Subscript +1
            }
        }
    }
}

Answer 1

So I don't know what happened to the other guy's answer, but he helped me through this process. I just want to extend my deepest gratitude for his effort. He never got impatient with me and I'm a tard when it comes to c#. He gave me the code to get it working. I just had to add the code for the text boxes. `namespace Project { public partial class Form1 : Form { public Form1() { InitializeComponent(); }

    private void btnExit_Click(object sender, EventArgs e)
    {
        this.Close();
    }

    private void btnVisited_Click(object sender, EventArgs e)
    {
        {
            string[] CityName = {"Columbus", "Bloomington", "Indianapolis",
            "Fort Wayne", "Greensburg", "Gary", "Chicago", "Atlanta", "Las Vegas"};
            string queryCity = txtState.Text;
            int position;
            string city;

            if (CityName.Contains(queryCity))
            {
                position = Array.IndexOf(CityName, queryCity);
                city = txtState.Text;
                txtAnswer.Text = "You have visited" +" " + queryCity + " " + position;
            }
            else
            {
                txtAnswer.Text = "You have not visited this city yet.";
            }
        }`

Answer 2

var idx = Array.IndexOf(CityName, QueryCity);
if (idx  != -1)
{
    // display QueryCity and idx
}
else
{
    // display "not visited"
}