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In 3, Searching, Modifying, and Encoding Text, you learned how to use regular expressions to validate user input. There are even specific examples in 3 for validating e-mail addresses. Although you could use regular expressions to validate input in this example, it would be redundant. The MailMessage object includes logic for validating input, as the next step demonstrates. In some circumstances, security might be important enough to justify having two levels of validation. In this example, the additional complexity and increased chance of introducing a bug are not justified.

On the Importing LDIF Files page, select all the listed LDIF files, and then click Next 13 On the Ready To Install page, review your selections, and then click Next AD LDS installs the new instance 14 Click Finish Your first instance has been created Open Server Manager and expand the Roles\Active Directory Lightweight Directory Services node to view the results of your operation AD LDS creates log files during the creation of the instance These files are located in the %SystemRoot%\Debug folder and are named ADAMSetuplog and ADAMSetup_loaderlog You can review them if you find issues during the creation of the instance Also, creating an instance creates a service for the instance You can launch the Services console from the Administrative Tools program group to verify the existence of this service..

Figure 13-35

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7. Build and run your project in Debug mode again. This time, type hello into the To and From e-mail address boxes, and then click the Send button. Notice that the runtime throws a FormatException if the user provides an e-mail address in an invalid format. Add a Catch block to catch a FormatException and display a message to the user, as the following code demonstrates:

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8. As shown in Figure 13-36, you are given the choice of keeping the version on the mobile PC, keeping the version on the network server, or keeping both versions but renaming the version on the mobile PC. Select to keep the version on the network server.

' VB Catch ex As FormatException MessageBox.Show("You must provide valid from and to e-mail addresses", _ "Invalid input", MessageBoxButtons.OK, MessageBoxIcon.Error) // C# catch (FormatException) { MessageBox.Show("You must provide valid from and to e-mail addresses", "Invalid input", MessageBoxButtons.OK, MessageBoxIcon.Error); }

In this exercise, you will create your first AD LDS replica instance, on the second member server you created 1 Make sure your domain controller, SERVER01contosocom, and your member servers, SERVER03contosocom and SERVER04contosocom, are running 2 Log on to SERVER04contosocom with the domain Administrator account 3 Launch the Active Directory Lightweight Directory Services Setup Wizard from the Administrative Tools program group 4 Review the information on the Welcome page, and then click Next 5 Under Setup Options, select A Replica Of An Existing Instance, and then click Next 6 On the Instance Name page, type ADLDSInstance, and then click Next 7 On the Ports page, provide the ports to communicate with this instance Use 50004 for LDAP and 50005 for the SSL port number Click Next 8 On the Joining A Configuration Set page, under Server, click Browse to locate Server 02.

8. Build and run your project. Populate the form s text boxes with valid data, and click Send. Nothing will happen yet because you haven t written code to send the message. You will complete this application in Lesson 2.

Figure 13-36

Type SERVER03, and then click Check Names Click OK, and then type 50004 into the LDAP Port field Click Next 9 On the Administrative Credentials For The Configuration Set page, select Currently Logged On User, and then click Next You should normally use a group, but the Administrator account will suffice for the purpose of this exercise 10 On the Copying Application Directory Partitions page, select the CN=ADLDSInstance,dc=contoso,dc=com partition, and then click Next 11 On the File Locations page, change the paths to D:\ADLDS\ADLDSInstance\Data, and then click Next 12 On the Service Account Selection page, select Network Service Account, and then click Next You should normally use a proper service account, but Network Service will suffice for the purpose of the exercise 13 On the AD LDS Administrators page, select Currently Logged On User, and then click Next.

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