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

1. You use Microsoft .NET Framework 4.0 to develop an ASP.NET 4 Web application.
You need to encrypt the connection string information that is stored in the web.config file. The application is
deployed to multiple servers.
The encryption keys that are used to encrypt the connection string information must be exportable and
importable on all the servers.
You need to encrypt the connection string section of the web.config file so that the file can be used on all of
the servers.
Which code segment should you use?

A) Configuration config = WebConfigurationManager.OpenMachineConfiguration ("~") ; ConnectionStringsSection section = (ConnectionStringsSection)config.GetSection ("connectionStrings") ; section.Sectionlnformation.ProtectSection("DpapiProtectedConfigurationProvider"); config.Save () ;
B) Configuration config = WebConfigurationManager.OpenMachineConfiguration("~"); ConnectionStringsSection section = (ConnectionStringsSection)config.GetSection("connectionStrings"); section.Sectionlnformation.ProtectSection("RsaProtectedConfigurationProvider'*); config.Save();
C) Configuration config = WebConfigurationManager.OpenWebConfiguration("~") ; ConnectionStringsSection section = (ConnectionStringsSection)config.GetSection("connectionStrings"); section.Sectionlnformation.ProtectSection("RsaProtectedConfigurationProvider"); config.Save();
D) Configuration config = WebConfigurationHanager.OpenWebConfiguration ("~") ; ConnectionStringsSection section = (ConnectionStringsSection)config.GetSection ("connectionStrings") ; section.Sectionlnformation.ProtectSection("DpapiProtectedConfigurationProvider"); config.Save ();

2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
You create a stored procedure to insert a new record in the Categories table according to following code
segment.
CREATE PROCEDURE dbo.InsertCategory @CategoryName navrchar(15),
@Identity int OUT
AS INSERT INTO Categories(CategoryName) VALUES (@CategoryName) SET @Identity = SCOPE_IDENTITY() RETURN @@ROWCOUNT
You add the following code fragment. (Line numbers are included for reference only.)
01 private static void ReturnIdentity(string connectionString)
02 {
03 using(SqlConnection connection = new SqlConnection(connectionString))
04 {
05 SqlDataAdpater adapter = new SqlDataAdapter("SELECT CategoryID,
CategoryName FROM dbo.Categories", connection);
06 adapter.InsertCommand = new SqlCommand("InsertCategory", connection);
07 adapter.InsertCommand.CommandType = CommandType.StoredProcedure;
08 SqlParameter rowcountParameter = adapter.InsertCommand.Parameters.Add
("@RowCount", SqlDbType.Int);
09 ...
10 adapter.InsertCommand.Parameters.Add("@CategoryName", SqlDbType.NChar,
15, "CategoryName");
11 SqlParameter identityParameter = adapter.InsertCommand.Parameters.Add
("@Identity", SqlDbType.Int, 0, "CategoryID");
12 ...
13 DataTable categories = new DataTable();
14 adapter.Fill(categories);
15 DataRow ctegoryRow = categories.NewRow();
16 categoryRow["CategoryName"] = "New beverages";
17 categories.Rows.Add(categoryRow);
18 adapter.Update(categories);
19 Int32 rowCount = (Int32)adapter.InsertCommand.Parameters
["@RowCount"].Value;
20 }
21 }
Which code elements needs to be added in the empty lines?

A) Insert the following code segment at line 09:
rowcountParameter.Direction = ParameterDirection.ReturnValue;
Insert the following code segment at line 12:
identityParameter.Direction = ParameterDirection.Output;
B) Insert the following code segment at line 09:
rowcountParameter.Direction = ParameterDirection.Output;
Insert the following code segment at line 12:
identityParameter.Direction = ParameterDirection.ReturnValue;
C) Insert the following code segment at line 09:
rowcountParameter.Direction = ParameterDirection.ReturnValue;
Insert the following code segment at line 12:
identityParameter.Direction = ParameterDirection.ReturnValue;
D) Insert the following code segment at line 09:
rowcountParameter.Direction = ParameterDirection.Output;
Insert the following code segment at line 12:
identityParameter.Direction = ParameterDirection.Output;

3. You use Microsoft .NET Framework 4.0 to develop an application that connects to a Microsoft SQL Server
200B database.
You populate a SqlDataAdapter by using the following code. (Line numbers are included for reference only.)
01 SqlDataAdapter dataAdapter1 = new SqlDataAdapter("SELECT * FROM
[BlogEntries] ORDER BY CreationDate", connection);
02 cmdBuilder = new SqlCommandBuilder(dataAdapter1);
03 dataAdapter1.Fill(BlogEntryDataSet, "BlogEntries");
04 ....
05 connection.Close();
You need to update the blog owner for all BlogEntry records. Which code segment should you insert at line 04?

A) SqlDataAdapter dataAdapter2 = new SqlDataAdapter(dataAdapterl.UpdateCommand); dataAdapter2.Fill(BlogEntryDataSet, "BlogEntries");
B) foreach(DataRow row in BlogEntryDataSet.Tables["BlogEntries"].Rows) {
row.Item["BlogOwner""] = "New Owner";
}
dataAdapter1.Fill(BlogEntryDataSet, "BlogEntries");
C) foreach(DataRow row in BlogEntryDataSet.Tables["BlogEntries"].Rows) {
row.Item["BlogOwner""] = "New Owner";
}
dataAdapter1.Update(BlogEntryDataSet, "BlogEntries");
D) SqlDataAdapter dataAdapter2 = new SqlDataAdapter("UPDATE [BlogEntries] SET [BlogOwner] = "New
'Owner' 3", connection);
dataAdapter2.Update(BlogEntryDataSet, "BlogEntries");

4. 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.
You use the following SQL statement to retrieve an instance of a DataSet object named ds:
SELECT CustomerID, CompanyName, ContactName, Address, City FROM dbo.Customers
You need to query the DataSet object to retrieve only the rows where the ContactName field is not NULL. Which code segment should you use?

A) from row in ds.Tables[0].AsEnumerable() where !row.IsNull((string)row["ContactName"]) select row;
B) from row in ds.Tables[0].AsEnumerable() where (string)row["ContactName"] != null select row;
C) from row in ds.Tables[0].AsEnumerable() where !Convert.IsDBNull(row.Field<string>("ContactName")) select row;
D) from row in ds.Tables[0].AsEnumerable() where row.Field<string>("ContactName") != null select row;

5. You use Microsoft Visual Studio 2010 and Microsoft ADO.NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server 2008 database.
You use the ADO.NET LINQ to SQL model to retrieve data from the database. You use stored procedures
to return multiple result sets.
You need to ensure that the result sets are returned as strongly typed values. What should you do?

A) Apply the ResultTypeAttribute to the stored procedure function and directly access the strongly typed object from the results collection.
B) Apply the ParameterAttribute to the stored procedure function. Use the GetResult<TElement> method to obtain an enumerator of the correct type.
C) Apply the FunctionAttribute and ResultTypeAttribute to the stored procedure function. Use the GetResult<TElement> method to obtain an enumerator of the correct type.
D) Apply the FunctionAttribute and ParameterAttribute to the stored procedure function and directly access the strongly typed object from the results collection.

Solutions: