textbox validation for allow one “ . ” value c#

Question

I want textbox validation for allowing only one . value and only numbers. Means my textbox value should take only numerics and one . value. Value shoul

Answer 1

try this one

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
    {
        if (!char.IsControl(e.KeyChar)
               && !char.IsDigit(e.KeyChar)
               && e.KeyChar != '.')
            e.Handled = true;

        // only allow one decimal point
        if (e.KeyChar == '.'
            && textBox1.Text.IndexOf('.') > -1)
            e.Handled = true;
    }