How can I make int input to string input C# - string

Question

How can I make int input to string input in C#? How can I change the int input to string input, so the user can write letters to the textbox, instead of numbers? I have tried myself, but the code won't work anymore. I know the solution is easy, but can't figure it out..
Here is my code:
public partial class MainWindow : Window
{
int[] arvat = new int[10];
int i = 0;
int k = 0;
public MainWindow()
{
InitializeComponent();
}
private void btnNimi_Click(object sender, RoutedEventArgs e)
{
int nimet = int.Parse( txtNimi.Text);
if (i < arvat.Length)
{
arvat[i] = nimet;
i++;
txtNimi.Text = "";
txtNimi.Focus();
}
else
{
MessageBox.Show("Kaikki arvat on syötetty.");
txtNimi.Text = "";
}
}
private void btnArpa_Click(object sender, RoutedEventArgs e)
{
int arpa = 0;
Random r = new Random();
arpa= r.Next(0, 9);
txbArvonta.Text = "";
for (int i = 0; i < arvat.Length; i++)
{
txbTeksti.Text = "\n" + "Kaikki osallistuneet: " + "\n";
txbArvonta.Text += arvat[i] + "\n";
int arpominen = arvat [k];
txbVoittaja.Text = "Ja voittaja on: " + arvat[arpa].ToString() + "\n" + "Onnea voittajalle!";
}

Answer 1

Instead of using Int.Parse, try using Int.TryParse to determine if the input will evaluate to a number before storing the result.
int number = 0;
bool isNumeric = Int32.TryParse(arvat[i], out number);
if (isNumeric)
{
Console.WriteLine("'{0}' is a number {1}.", arvat[i], number);
}
else
{
Console.WriteLine("'{0}' is text.", arvat[i]);
}