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} 30. Create a Click event handler for the Add String button and add this code to demonstrate that both Singleton references, singletonOne and singletonTwo, refer to the same instance of Singleton. 31. Visual Basic 32. Private Sub addString_Click(ByVal sender As System.Object, _ 33. ByVal e As System.EventArgs) Handles addString.Click 34. 35. 36. 37. 38. 39. 40. 41. 42. 44. 45. // Visual C# 46. private void addString_Click(object sender, System.EventArgs e) { 47. 48. 49. 50. 51. 52. 53. 54. 55. } You could also add a test to the button that simply tests whether the references are the same: Visual Basic listTwo.DataSource = null; listTwo.Items.Clear(); listTwo.DataSource = singletonTwo.GetStrings(); listOne.DataSource = null; listOne.Items.Clear(); listOne.DataSource = singletonOne.GetStrings(); singletonOne.AddString(newString.Text); listTwo.DataSource = Nothing listTwo.Items.Clear() listTwo.DataSource = singletonTwo.GetStrings() listOne.DataSource = Nothing listOne.Items.Clear() listOne.DataSource = singletonOne.GetStrings() singletonOne.AddString(newString.Text)

Shared assemblies are usually stored in the GAC, but this isn t a requirement. For exam ple, you might deploy a shared assembly in a known directory on the hard disk, where two or more applications can find it. However, the advantages in the preceding list apply only to shared assemblies in the GAC. (Shared assemblies deployed in other directories do support side-by-side execution and public key signing, though.) As a rule, you write code for private and shared assemblies in the same way because you build a shared assembly by adding an attribute to your code. However, the main goal in building shared assemblies is to share them among different applications, so you must take this constraint into account. For example, a shared assembly shouldn t create temporary files with fixed names and paths because calls from different clients might overwrite such files. Moreover, the .NET Framework supports side-by-side exe cution of shared assemblies in the same process (not just the same machine), so a shared assembly shouldn t depend on processwide resources.

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The m aj or concept ual difference bet ween using a v iew st at e var iable and a Session variable is t hat t he v iew st at e var iable r esides on t he Web page, w hile t he Session var iable t ypically resides in t he m em or y of t he Web ser ver While t he view st at e var iable is an exam ple of client - side t echnology, t he Session var iable is a serv er- based variable The v iew st at e var iable is on t he Web page for each round- t r ip of a Web page bet ween a browser and a Web ser ver.

The Session variable r esides on t he Web serv er ( or ev en anot her ser ver, such as a Windows serv er or SQL Ser ver inst ance) This m eans t hat you m ust keep t he am ount of dat a t hat y ou pass wit h a v iew st at e var iable t o a m anageable size because passing a large am ount of dat a can lengt hen t he durat ion of a round- t r ip Because a Session variable ex ist s on a Web ser ver, y ou can have a relat iv ely large Session var iable on t he ser ver and copy only a sm all port ion of it t o a Web page on successive round- t r ips.

For exam ple, t he serv er can hold all or ders or all product s in a Session v ariable repr esent ing a dat a set How ev er , any giv en round- t r ip of a page bet ween a br owser and ser ver can show j ust t he or ders for one cust om er or t he product s in one cat egory Because a v iew st at e var iable doesn t hav e t his flex ibilit y, it will hav e t o send all t he dat a back and fort h on each round- t r ip or draw a fresh collect ion of dat a fr om a dat abase server on each round- t r ip.

If installing from a RISetup image, Windows Setup switches to GUI-mode setup at the Installing Windows portion. Setup continues, using the information specified by the .sif answer files and prompting you for configuration data that was left unspecified. If installing from a RIPrep image, the Mini-Setup is performed, and the computer is rebooted again, this time into a fully functional Windows Server 2003 installation with the configuration settings reflecting the master installation on which the RIPrep OS image is based.

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