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requires another activity either an EventDriven, StateInitialization, or StateFinalization activity to be placed within the State activity. Therefore, the State activity is a composite activity because it s made up of one or more other activities. Right-click the FirstState State activity and choose AddEventDriven. When you do this, the designer surface will change, as shown in Figure 2-8.

For instance, if Alice sends a personal message to Bob, Carol might be able to intercept that communication and decrypt it because the key is public If Bob wants to receive confidential.

You declare the Image control using the <Image> tag in XAML. The Source attribute specifies the location of the image to load into the control. It will look like this: <Image Source="Fish.jpg" /> If you want the image to fit within a specified area, you can do so using the Width and Height properties. So, for example, the following XAML will fit an image into a 200 200 square, regardless of its original ratio: <Image Source="Fish.jpg" Height="200" Width="200" /> If you want to keep the original aspect ratio of the image but limit it to 200 pixels high, you ll use this: <Image Source="Fish.jpg" Height="200" />

messages from both Alice and Carol such that only he can decrypt these communications, he would need two symmetric keys. He would share one of these keys with Alice, and the other with Carol. If Bob were seeing another woman, Denise, then he would have to share a third key with her. Unfortunately, Bob would somehow need to agree with Alice, Carol, and Denise on keys. Asymmetric key cryptography, however, allows us to solve this problem without requiring Bob to agree upon different keys individually with Alice, Carol, and Denise. In an asymmetric scheme, Bob has two keys: a public key and a private (or secret) key. Bob publishes his public key in the directory. Alice, Carol, and even Denise can send confidential messages to Bob by encrypting them with his public key. Due to the way asymmetric key cryptography works, when Alice sends Bob a message encrypted with his public key, neither Carol nor Denise can decrypt that message. Using Bob s private key is the only way to decrypt the message. Since Bob keeps his private key secret, only he can decrypt messages that people send him that are encrypted with his public key. Once Bob publishes his public key in a public directory, Alice and Carol can look up that key and use it to encrypt and send confidential messages to Bob. Anyone could look up Bob s key in the directory to send him a confidential message. Only Bob would be able to decrypt these messages.

A good practice for performance reasons is to use DecodePixelWidth or DecodePixelHeight alongside Width or Height and to set it to the same respective size. These cache the resized image instead of the source one, saving lots of application memory. To use these, you use the <BitmapImage> tag, which is available in the XAML schema as a child of Image.Source. Thus, instead of declaring an image using this syntax: <Image Source="Fish.jpg" Height="200"> you can get more fine-grained control using this syntax: <Image Height="200"> <Image.Source> <BitmapImage DecodePixelHeight="200" UriSource="Fish.jpg" /> </Image.Source> </Image>

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