private void btnStart_Click(object sender, EventArgs e)
{
//varibles
int firstNumber;
int secondNumber;
//clear listbox
this.lstAlphabet.Items.Clear();
for (firstNumber = 65; firstNumber <= 90; firstNumber++)
{
for (secondNumber = 97; secondNumber <= 122; secondNumber++)
{
this.lstAlphabet.Items.Add(Char.ConvertFromUtf32(firstNumber) + " --> " + Char.ConvertFromUtf32(secondNumber));
}
}
}
}
}