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around, the LED will not only fail to illuminate but will also prevent electricity from flowing across its terminals. The diode has a white band around it next to the negative lead. Imagine the white band as being a barrier. Electricity flows through the diode from the terminal that has no barrier. When you reverse the voltage and try to make it flow through the side that has the white band, the current will be stopped. Diodes are essential in protecting circuits from a reverse voltage, such as if you connecting a power supply the wrong way around or if a voltage is reversed such as the back EMF in your circuit. Therefore, always try to use them in your circuits wherever there is a danger of the power being reversed either by user error or via phenomena such as back EMF.

1. Add a new page to the BalloonShop application called Checkout.aspx and modify the code as follows: <%@ Page Language="C#" MasterPageFile="~/BalloonShop.master" AutoEventWireup="true" CodeFile="Checkout.aspx.cs" Inherits="Checkout" %> <%@ Register TagPrefix="uc1" TagName="CustomerDetailsEdit" Src="UserControls/CustomerDetailsEdit.ascx" %> <asp:Content ID="Content1" ContentPlaceHolderID="contentPlaceHolder" runat="Server"> <asp:Label ID="titleLabel" runat="server" CssClass="ShoppingCartTitle" Text="Your Shopping Cart" /> <br /> <br /> <asp:GridView ID="grid" runat="server" AutoGenerateColumns="False" DataKeyNames="ProductID" BorderWidth="1px" Width="100%"> <Columns> <asp:BoundField DataField="Name" HeaderText="Product Name" ReadOnly="True" SortExpression="Name" /> <asp:BoundField DataField="Price" DataFormatString="{0:c}" HeaderText="Price" ReadOnly="True" SortExpression="Price" /> <asp:BoundField DataField="Quantity" HeaderText="Quantity" ReadOnly="True" SortExpression="Quantity" />

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<asp:BoundField DataField="Subtotal" DataFormatString="{0:c}" HeaderText="Subtotal" ReadOnly="True" SortExpression="Subtotal" /> </Columns> </asp:GridView> <asp:Label ID="Label2" runat="server" Text="Total amount: " CssClass="ProductDescription" /> <asp:Label ID="totalAmountLabel" runat="server" Text="Label" CssClass="ProductPrice" /> <br /> <br /> <uc1:CustomerDetailsEdit ID="CustomerDetailsEdit1" runat="server" Editable="false" Title="User Details" /> <br /> <asp:Label ID="InfoLabel" runat="server" CssClass="InfoText" /> <br /> <br /> <asp:Button ID="placeOrderButton" runat="server" CssClass="ButtonText" Text="Place order" OnClick="placeOrderButton_Click" /> </asp:Content> 2. Modify Checkout.aspx.cs as follows: public partial class Checkout : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { // Set the title of the page this.Title = BalloonShopConfiguration.SiteName + " : Checkout"; if (!IsPostBack) PopulateControls(); } // fill controls with data private void PopulateControls() { // get the items in the shopping cart DataTable dt = ShoppingCartAccess.GetItems(); // populate the list with the shopping cart contents grid.DataSource = dt; grid.DataBind(); // setup controls titleLabel.Text = "These are the products in your shopping cart:"; grid.Visible = true;

Binary large objects (BLOBs) are supported in many databases, including SQLite. However, the Android model is more aimed at supporting such hunks of data via their own separate content Uri values. A content provider, therefore, does not provide direct access to binary data, like photos, via a Cursor. Rather, a property in the content provider will give you the content Uri for that particular BLOB. You can use getInputStream() and getOutputStream() on your ContentProvider to read and write the binary data. Quite possibly, the rationale is to minimize unnecessary data copying. For example, the primary use of a photo in Android is to display it to the user. The ImageView widget can do just that, via a content Uri to a JPEG file. By storing the photo in a manner that has its own Uri, you do not need to copy data out of the content provider into some temporary holding area just to be able to display it just use the Uri. The expectation, presumably, is that few Android applications will do much more than upload binary data and use widgets or built-in activities to display that data.

In the previous project, you used a transistor to control the motor. In this project, you are going to use a very popular motor driver IC called an L293D. The advantage of using this chip is that you can control two motors at the same time, plus you can control their direction. The chip can also be used to control a stepper motor, as you will find out in Project 28. (You can also use a pin-for-pin compatible chip known as the SN754410, which has a higher current rating.) Notice anything missing from the parts list Diodes, perhaps Not to worry; the IC has its own internal diodes, so you do not need one for this project.

// display the total amount decimal amount = ShoppingCartAccess.GetTotalAmount(); totalAmountLabel.Text = String.Format("{0:c}", amount); // check customer details bool addressOK = true; bool cardOK = true; if (Profile.Address1 + Profile.Address2 == "" || Profile.ShippingRegion == "" || Profile.ShippingRegion == "Please Select" || Profile.Country == "") { addressOK = false; } if (Profile.CreditCard == "") { cardOK = false; } // report / hide place order button if (!addressOK) { if (!cardOK) { InfoLabel.Text = "You must provide a valid address and credit card " + "before placing your order."; } else { InfoLabel.Text = "You must provide a valid address before placing your " + "order."; } } else if (!cardOK) { InfoLabel.Text = "You must provide a credit card before " + "placing your order."; } else { InfoLabel.Text = "Please confirm that the above details are " + "correct before proceeding."; } placeOrderButton.Visible = addressOK && cardOK; }

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