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

1. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application uses the ADO.NET Entity Framework to model entities.
The application allows users to make changes while disconnected from the data store.
Changes are submitted to the data store by using the SubmitChanges method of the DataContext object.
You receive an exception when you call the SubmitChanges method to submit entities that a user has
changed in offline mode.
You need to ensure that entities changed in offline mode can be successfully updated in the data store.
What should you do?

A) Call the SaveChanges method of DataContext with a value of false.
B) Set the DeferredLoadingEnabled property of DataContext to true.
C) Set the ObjectTrackingEnabled property of DataContext to true.
D) Call the SubmitChanges method of DataContext with a value of System.Data.Linq.ConflictMode.ContinueOnConflict.

2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create a Windows Forms
application.
The application connects to a Microsoft SQL Server database.
You need to find out whether the application is explicitly closing or disposing SQL connections. Which code
segment should you use?

A) string instanceName = Assembly.GetEntryAssembly().FullName; PerformanceCounter perf = new PerformanceCounter( ".NET Data Provider for SqlServer",
"NumberOfReclaimedConnections", instanceName, true); int leakedConnections = (int)perf.NextValue();
B) string instanceName = Assembly.GetEntryAssembly().GetName().Name; PerformanceCounter perf = new PerformanceCounter( ".NET Data Provider for SqlServer",
"NumberOfNonPooledConnections", instanceName, true); int leakedConnections = (int)perf.NextValue();
C) string instanceName = Assembly.GetEntryAssembly().FullName; PerformanceCounter perf = new PerformanceCounter( ".NET Data Provider for SqlServer",
"NumberOfNonPooledConnections", instanceName, true); int leakedConnections = (int)perf.NextValue();
D) string instanceName = Assembly.GetEntryAssembly().GetName().Name; PerformanceCounter perf = new PerformanceCounter( ".NET Data Provider for SqlServer",
"NumberOfReclaimedConnections", instanceName, true); int leakedConnections = (int)perf.NextValue();

3. You use Microsoft .NET Framework 4.0 to develop an application that connects to a Microsoft SQL Server
2008 database.
You add the following table to the database.
CREATE TABLE Orders( ID numeric(18, 0) NOT NULL, OrderName varchar(50) NULL, OrderTime time(7) NULL, OrderDate date NULL)
You write the following code to retrieve data from the OrderTime column. (Line numbers are included for reference only.)
01 SqlConnection conn = new SqlConnection("...");
02 conn.Open();
03 SqlCommand cmd = new SqlCommand("SELECT ID, OrderTime FROM Orders", conn);
04 SqlDataReader rdr = cmd.ExecuteReader();
05 ....
06 while(rdr.Read())
07 {
08 ....
09 }
You need to retrieve the OrderTime data from the database. Which code segment should you insert at line 08?

A) string time = (string)rdr[1];
B) DateTime time = (DateTime)rdr[1];
C) TimeSpan time = (TimeSpan)rdr[1];
D) Timer time = (Timer)rdr[1];

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
You use a TableAdapter object to load a DataTable object.
The DataTable object is used as the data source for a GridView control to display a table of customer
information on a Web page.
You need to ensure that the application meets the following requirements:
-Load only new customer records each time the page refreshes.
-Preserve existing customer records. What should you do?

A) Set the ClearBeforeFill property of the TableAdapter to false. Use the Fill method of the TableAdapter.
B) Set the ClearBeforeFill property of the TableAdapter to true. Use the Fill method of the TableAdapter to load additional customers.
C) Set the ClearBeforeFill property of the TableAdapter to true. Use the GetData method of the TableAdapter to create a new DataTable.
D) Set the ClearBeforeFill property of the TableAdapter to false. Use the GetData method of the TableAdapter to create a new DataTable.

5. You use Microsoft .NET Framework 4.0 to develop an application.
You write the following code to update data in a Microsoft SQL Server 2008 database.
(Line numbers are included for reference only.)
01 private void ExecuteUpdate(SqlCommand cmd, string connString, string
updateStmt)
02 {
03 ...
04 }
You need to ensure that the update statement executes and that the application avoids connection leaks. Which code segment should you insert at line 03?

A) using (SqlConnection conn = new SqlConnection(connString))
{
cmd.Connection = conn;
cmd.CommandText = updateStmt;
cmd.ExecuteNonQuery();
cmd.Connection.Close();
}
B) SqlConnection conn = new SqlConnection(connString); conn.Open(); cmd.Connection = conn; cmd.CommandText = updateStmt; cmd.ExecuteNonQuery();
C) using (SqlConnection conn = new SqlConnection(connString))
{
conn.Open() ;
cmd.Connection = conn;
cmd.CommandText = updateStmt;
cmd.ExecuteNonQuery() ;
}
D) SqlConnection conn = new SqlConnection(connString); conn.Open(); cmd.Connection = conn; cmd.CommandText = updateStmt; cmd.ExecuteNonQuery(); cmd.Connection.Close() ;

Solutions: