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Microsoft TS: Accessing Data with Microsoft .NET Framework 4 Sample Questions:

1. You add a table to the database to track changes to part names. The table stores the following row values:
-the username of the user who made the change
-a part ID
-the new part name
-a DateTime value
You need to ensure detection of unauthorized changes to the row values.
You also need to ensure that database users can view the original row values.

A) Add a column named hash. Use System.Security.Cryptography.MD5 to create an MD5 hash of the row values, and store in the hash column.
B) Use System.Security.Cryptography.RSA to encrypt all the row values. Publish only the key internally.
C) Use System.Security.Cryptography.DES to encrypt all the row values using an encryption key held by the application.
D) Add a column named signature. Use System.Security.Cryptography.RSA to create a signature for all of the row values. Store the signature in the signature column. Publish only the public key internally.

2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server database and contains a LINQ to SQL data model.
The data model contains a function named createCustomer that calls a stored procedure.
The stored procedure is also named createCustomer. The createCustomer function has the following
signature.
createCustomer (Guid customerID, String customerName, String address1)
The application contains the following code segment. (Line numbers are included for reference only.)
01 CustomDataContext context = new CustomDataContext(); 02 Guid userID = Guid.NewGuid();
03 String address1 = "1 Main Steet";
04 String name = "Marc";
05 ...
You need to use the createCustomer stored procedure to add a customer to the database. Which code segment should you insert at line 05?

A) context.ExecuteQuery(typeof(Customer), "createCustomer", customer);
B) context.ExecuteCommand("createCustomer", userID, customer1, address1); Customer customer = new Customer() { ID = userID, Address1 = address1, Name = customer1, };
C) context.ExecuteCommand("createCustomer", customer); Customer customer = new Customer() { ID = userID, Address1 = address1, Name = customer1, };
D) context.createCustomer(userID, customer1, address1);

3. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server database. The application uses DataContexts to query
the database.
The application meets the following requirements:
-Stores customer data offline.
-Allows users to update customer records while they are disconnected from the server.
-Enables offline changes to be submitted back to the SQL Server by using the DataContext object.
You need to ensure that the application can detect all conflicts that occur between the offline customer information submitted to the SQL Server and the server version. You also need to ensure that you can roll back local changes. What should you do?

A) Add a try/catch statement around calls to the SubmitChanges method of the DataContext object and catch ChangeConflictExceptions.
B) Override the Update operation of the DataContext object. Call the ExecuteDynamicUpdate method to generate the update SQL.
C) Add a try/catch statement around calls to the SubmitChanges method of the DataContext object and catch SqlExceptions.
D) Call the SubmitChanges method of the DataContext object. Pass System.Data.Linq.ConflictMode.ContinueOnConflict to the method.

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create a Windows Forms
application.
You plan to deploy the application to several shared client computers. You write the following code
segment.
(Line numbers are included for reference only.)
01 Configuration config = ConfigurationManager.OpenExeConfiguration
(exeConfigName);
02 ...
03 config.Save();
04 ...
You need to encrypt the connection string stored in the .config file. Which code segment should you insert at line 02?

A) ConnectionStringsSection section = config.GetSection("connectionString") as ConnectionStringsSection; section.SectionInformation.ProtectSection("DataProtectionConfigurationProvider");
B) ConnectionStringsSection section = config.GetSection("connectionString") as ConnectionStringsSection; section.SectionInformation.ProtectSection("RsaProtectedConfigurationProvider");
C) ConnectionStringsSection section = config.GetSection("connectionStrings") as ConnectionStringsSection; section.SectionInformation.ProtectSection("DataProtectionConfigurationProvider");
D) ConnectionStringsSection section = config.GetSection("connectionStrings") as ConnectionStringsSection; section.SectionInformation.ProtectSection("RsaProtectedConfigurationProvider");

5. You use Microsoft .NET Framework 4.0 to develop an application that uses LINQ to SQL.
The Product entity in the LINQ to SQL model contains a field named Productlmage. The Productlmage field
holds a large amount of binary data.
You need to ensure that the Productlmage field is retrieved from the database only when it is needed by the
application. What should you do?

A) Set the Delay Loaded property on the Productlmage property of the Product entity to True.
B) When the context is initialized, specify that the Productlmage property should not be retrieved by using DataLoadOptions
C) Set the Update Check property on the Productlmage property of the Product entity to Never.
D) Set the Auto-Sync property on the Productlmage property of the Product entity to Never.

Solutions: