Numeric TextBox

Question

Im new to programming and I dont know very much about but I\'m making a calculator, and i want to use a textbox that only acepts numbers and decimals, and when the user past

Answer 1

useful for decimal numeric entry but has some bugs if (rightclick and paste) the other text. :D

 private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
    {
        string original = (sender as TextBox).Text;
        if (!char.IsDigit(e.KeyChar))
        {
            e.Handled = true;
        }
        if (e.KeyChar == '.')
        {
            if (original.Contains('.'))
                e.Handled = true;
            else if (!(original.Contains('.')))
                e.Handled = false;

        }
        else if (char.IsDigit(e.KeyChar)||e.KeyChar=='\b')
        {
            e.Handled = false;
        }

    }