windows form when you you want to user can not press invalid data in textbox or comboBox then pass the ASC ii value on and between...............

windows form when you you want to user can not press invalid data in textbox or comboBox then pass the ASC  ii  value on and between...............



 private void txtSearch_KeyPress(object sender, KeyPressEventArgs e)
        {
            try
            {
                if ((e.KeyChar >= 65 && e.KeyChar <= 90) || (e.KeyChar >= 97 && e.KeyChar <= 122) || (e.KeyChar >= 48 && e.KeyChar <= 57) || e.KeyChar == 32 || e.KeyChar == 8)
                {
                    e.Handled = false;
                }
                else
                {
                    e.Handled = true;
                    MessageBox.Show("Invalied");
                }
            }
            catch (Exception)
            {
             //   throw;
            }
        }