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Here s how to do this. When a consumer is looking at your product on your Web site, there should always be a Receive a valuable additional premium button on the site next to the item. When consumers click on that button, they see a panel where they enter their name, address, and email address. If they have already printed a certi cate from your site on this or a previous visit, the panel is automatically lled in, and all they need to do is to click on the Send Certi cate button. When they click on this button, they will be sent an email containing the certi cate as an attachment, which they can print on their PC printer. Are you afraid that some customers will abuse the certi cates No problem. You maintain a database, and if you allow only one certi cate per product per email address, your Web site can easily control that. What the certi cate contains are two bar codes. There is a bar code for the product to be purchased and a bar code that has been created for the customer. To use the certi cate for a mail-in rebate, the customer takes it to a retailer, buys the product, and receives a purchase receipt. He mails the certi cate with the purchase receipt to the address shown on the certi cate. At the ful llment center, the certi cate is scanned, capturing the product and customer data. There is no need for

A query continuation clause takes the result of one part of a query and assigns it a name so that it can be used in another part of the query. Figure 21-12 shows the syntax for query continuation.

Figure 21-12. The syntax of the query continuation clause For example, the following query joins groupA and groupB and names the join groupAandB. It then performs a simple select from groupAandB. static void Main() { var groupA = new[] { 3, 4, 5, 6 }; var groupB = new[] { 4, 5, 6, 7 }; var someInts = from a in groupA join b in groupB on a equals b into groupAandB Query continuation from c in groupAandB select c; foreach (var a in someInts) Console.Write("{0} ", a); } This code produces the following output: 4 5 6

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data entry at the ful llment center, since your Web application automatically transmits all customer names to the center along with their bar codes at the time they are sent the emailed certi cate The ful llment center simply checks the purchase receipt against the database created by the Web site and clicks OK If a rebate is involved, a check is issued and mailed automatically A variation of this method, which can save the manufacturer money, is to have the customer provide his credit card data, which can also be converted to a bar code lookup table (not the actual credit card number) by the Web site software At the ful llment center, the scanning process can credit the rebate to the customer s credit card account, thus saving the cost of mailing a check.

Console.WriteLine("{0}", del (12)); Console.WriteLine("{0}", le1 (12)); Console.WriteLine("{0}", le3 (12)); }

The customer receives an email from the ful llment house simultaneously with the mailing of a check or the crediting of the credit card There are several important elements in this process: The customer cannot provide a fake email address, since a valid email address is required in order to get the certi cate She can t provide a fake name or address, or she will not get a cashable check She can t provide a fake credit card number, or she won t get a refund In applying for the rebate, the customer gives permission for the use of her email address for future promotions If she does not want to receive information, the rebate could be smaller or not available The manufacturer gains a database of customers and email addresses, which can be used for promotion.

Console.WriteLine("{0}", le2 (12)); Console.WriteLine("{0}", le4 (12));

Some important points about lambda expression parameter lists are the following: The parameters in the parameter list of a lambda expression must match that of the delegate in number, type, and position. The parameters in the parameter list of an expression do not have to include the type (that is, implicitly typed) unless the delegate has either ref or out parameters in which case the types are required (that is, explicitly typed). If there is only a single parameter and it is implicitly typed, the surrounding parentheses can be omitted. Otherwise, they are required. If there are no parameters, you must use an empty set of parentheses. Figure 15-16 shows the syntax for lambda expressions.

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