Index Out Of Range Exception .

public ArrayList getProducts()
        {
            using (SqlConnection con = new SqlConnection(ConnectionString))
            {
                SqlCommand cmd = new SqlCommand("procReturnAllProducts", con);
                cmd.CommandType = CommandType.StoredProcedure;
                ArrayList productsList = new ArrayList();
                try
                {
                    con.Open();
                    SqlDataReader reader = cmd.ExecuteReader();
                    while (reader.Read())
                    {
                        Products products = new Products(Convert.ToInt32(reader["productID"]), Convert.ToString(reader["productName"]), Convert.ToInt32(reader["supplierID"]), Convert.ToInt32(reader["categoryID"]), Convert.ToString(reader["quantityPerUnit"]), Convert.ToDouble(reader["unitPrice"]), Convert.ToInt16(reader["unitInStoct"]), Convert.ToInt16(reader["unitOnOrder"]), Convert.ToInt16(reader["reOrderLevel"]), Convert.ToBoolean(reader["discontinue"]));
                        productsList.Add(products);
                    }//End while
                    reader.Close();
                }
                catch (SqlException)
                {
                    throw new ApplicationException("Error connection to database");
                }
                return productsList;
            }//End Using
        }

public partial class Form1 : Form
    {
        public ProductsBL productBL;
        public ArrayList prodList;
        public Form1()
        {
            InitializeComponent();
             productBL = new ProductsBL();
             prodList = new ArrayList();
             prodList = productBL.getProducts();
             dataGridView1.DataSource = prodList;
        }
    }