Validate TextBox control for float value

Question

Hi Techies,

I am making a windows form.

I am trying to validate a text box to accept only float value. Below is the code, where txtPurchasePrice is my textBox. The code below works fine:-

private void txtPurchasePrice_TextChanged(object sender, EventArgs e)
        {
            
            txtPurchasePrice.KeyPress += new KeyPressEventHandler(rtbQuantity_KeyPress);
        }


        private void rtbQuantity_KeyPress(object sender, KeyPressEventArgs e)
        {
            ////if ((e.KeyChar >= '0') || (e.KeyChar <= '9'))
            ////    e.Handled = true;

            if (!char.IsNumber(e.KeyChar) & (Keys)e.KeyChar != Keys.Back
            & e.KeyChar != '.')
            {
                e.Handled = true;
            }

            base.OnKeyPress(e);

        }

Problem: It accepts only first letter as alphabet, rest is OK. (means not working on first entered letter)

Help Plzz.
-------------------------------
Chandrabhan Pradhan
[email protected]