how to generate barcode in asp net core

how to generate barcode in asp net core

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BMW developed a unique program for building a relationship with prospects even before the prospect made a rm decision to purchase a car. The process was called Extending the Dialogue. BMW produces luxury cars that have a erce customer brand loyalty. At the time that BMW started this program, the entire luxury car marketplace was sharply down sales were 9 percent below the previous year s sales. In addition, BMW s key competitors, Mercedes Benz and Lexus, were expanding their product lines with strong product offerings. The start of the new BMW program was a real-time prospect scoring system that identi ed BMW s best prospects. The program was set up to communicate with these targeted prospects over a 6-week period. Before the program could begin, Kay Madati, director of relationship marketing, the genius behind the program for BMW, asked msdbm of Los Angeles for help in overcoming a number of signi cant obstacles: Twelve different data systems had to be combined into a common marketing database. BMW had to get multiple departments to cooperate with one another and to share their data freely with a central source. BMW had to create an environment in which there was unsel sh sharing of response and sales information among competing vendors. The company had to get a highly successful and independent dealer organization to share its information with BMW. It had to get prospects to describe their purchase intentions. It had to recognize that high-end consumers do not respond well to direct marketing efforts because they receive them from many companies.

You can control access to your events using the public, protected, internal, and private keywords. See 7 for details of these keywords and the effect they have on fields. You should not use the virtual modifier on events. If you do, it is possible that your events will not be delivered properly. If you want to override an event from a base class, then you should mark the OnXXX method as virtual and override the method in the derived class. Listing 10-16 provides a demonstration. You can find more details and examples of overriding methods in 9. Listing 10-16. Deriving Event Implementations class Calculator { public event EventHandler<CalculationEventArgs> CalculationPerformedEvent; public int CalculateProduct(int num1, int num2) { // perform the calculation int result = num1 * num2; // publish the event OnCalculationPerformed(new CalculationEventArgs(num1, num2, result)); // return the result return result; } protected virtual void OnCalculationPerformed(CalculationEventArgs args) { // make a copy of the event EventHandler<CalculationEventArgs> handler = CalculationPerformedEvent; // check to see we have subscribers if (handler != null) { handler(this, args); } } } class DerivedCalc : Calculator { protected override void OnCalculationPerformed(CalculationEventArgs args) { // perform custom logic here // call the base method base.OnCalculationPerformed(args); } } In this example, the DerivedCalc class overrides the OnCalculationPerformed method, which has been marked as virtual in the base Calculator class. The overridden method can perform modifications to the custom EventArgs implementation (or perform any other required task) before calling the base OnCalculationPerformed method to publish the event.

The Func and Action classes are special types that allow you to use delegates without having to specify a custom delegate type. They are used throughout the .NET Framework. For example, you will see examples of both when we look at parallel programming.

Action delegates encapsulate methods that do not return results. In other words, they can be used only with methods that are defined with the void keyword. The simplest Action delegate is the System.Action class, which is used for methods that have no parameters (and no results). Listing 10-17 contains an example. Listing 10-17. Using the Basic Action Delegate using System; class Calculator { public void CalculateProduct() { // perform the calculation int result = 10 * 20; // print out a message with the result Console.WriteLine("Result: {0}", result); } } class Listing 17 { static void Main(string[] args) { // create a new instance of Calculator Calculator calc = new Calculator(); // create an action and assign a method Action act = calc.CalculateProduct; // invoke the method via the Action act(); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The key statement in Listing 10-17 is shown in bold; it creates a new local Action variable and assigns the CalculateProduct method from an instance of Calculator as the value. The Action is then