protected void QuantityAddButton_Click(object sender, EventArgs e)
        {
            String cs = ConfigurationManager.ConnectionStrings["MyDatabaseConnectionString1"].ConnectionString;

            using (SqlConnection con = new SqlConnection(cs))
            {
                SqlCommand cmd = new SqlCommand("insert into ProductQuantityTable values('" + ProductDropDownId.SelectedItem.Value + "','" + ProductQuantityTextBox.Text + "')", con);
                con.Open();
                cmd.ExecuteNonQuery();
                ProductQuantityTextBox.Text = string.Empty;
                ProductDropDownId.ClearSelection();
                ProductDropDownId.Items.FindByValue("0").Selected = true;
            }
        }
        private void BindAllProductId()
        {
            String cs = ConfigurationManager.ConnectionStrings["MyDatabaseConnectionString1"].ConnectionString;

            using (SqlConnection con = new SqlConnection(cs))
            {
                SqlCommand cmd = new SqlCommand("select * from ProductTable ", con);
                con.Open();
                SqlDataAdapter sda = new SqlDataAdapter(cmd);
                DataTable      dt  = new DataTable();
                sda.Fill(dt);
                //Response.Write(dt1.Rows.Count);
                if (dt.Rows.Count != 0)
                {
                    ProductDropDownId.DataSource     = dt;
                    ProductDropDownId.DataTextField  = "ProductName";
                    ProductDropDownId.DataValueField = "ProductId";
                    ProductDropDownId.DataBind();
                    ProductDropDownId.Items.Insert(0, new ListItem("-Select-", "0"));
                }
            }
        }