try-catch for Inventory

 public string Product_Name(string name)
        {
            try
            {
                if (!Regex.IsMatch(name, @"^[a-zA-Z]+$"))
                    return name;
            }

                catch (StringFormatException sfe)
                {
                Console.WriteLine("String Format Exception " + sfe.Message);
                }

        }
        public int Quantity(string qty)
        {
            try
            {
                if (!Regex.IsMatch(qty, @"^[0-9]"))
                    //Exception here
                    return Convert.ToInt32(qty);
            }
            catch (NumberFormatException nfe)
            {
                Console.WriteLine("Number Format Exception " + nfe.Message);
            }

        }
        public double SellingPrice(string price)
        {
            try
            {
                if (!Regex.IsMatch(price.ToString(), @"^(\d*\.)?\d+$"))
                    //Exception here
                    return Convert.ToDouble(price);
            }
           catch (CurrencyFormatException cfe)
            {
                Console.WriteLine("Currency Format Exception " + cfe.Message);
            }
        }