How do make the texbox accept only numerics, del key and backspace?

public partial class Form1 : Form
    {
        /// <summary>
        /// Whether Del is pressed or not
        /// </summary>
        private bool isDelPressed = false;
 
        public Form1()
        {
            InitializeComponent();
        }
 
        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            int n = (int)e.KeyChar;
            e.Handled = !(n == 8 || (n >= 48 && n <= 57) || isDelPressed);
        }
 
        private void textBox1_KeyDown(object sender, KeyEventArgs e)
        {
            isDelPressed = (e.KeyCode == Keys.Delete);
        }
    }

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