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Microsoft 70-516 Exam Sample Questions

Question: 1

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create an application. The application contains the following code segment. (Line numbers are included for reference only.)

01 class DataAccessLayer

02 {

03 private static string connString;

04

05 …

06 public static DataTable GetDataTable(string command){

07

08 …

09 }

10 }

You need to define the connection life cycle of the DataAccessLayer class. You also need to ensure that the application uses the minimum number of connections to the database. What should you do?

  1. Insert the following code segment at line 04.

private static SqlConnection conn = new SqlConnection(connString);

public static void Open(){

conn.Open();

}

public static void Close(){

conn.Close();

}

B.Insert the following code segment at line 04.

private SqlConnection conn = new SqlConnection(connString);

public void Open(){

conn.Open(); }

public void Close(){

conn.Close();

}

C.Replace line 01 with the following code segment.

class DataAccessLayer : IDisposable

Insert the following code segment to line 04.

private SqlConnection conn = new SqlConnection(connString);

public void Open(){

conn.Open();

}

public void Dispose(){

conn.Close();

}

D.Insert the following code segment at line 07.

using (SqlConnection conn = new SqlConnection(connString)){

conn.Open();

}


Answer: D

Explanation:

One thing you should always do is to make sure your connections are always opened within a using statement.

Using statements will ensure that even if your application raises an exception while the connection is open, it will always be closed

(returned to the pool) before your request is complete. This is very important, otherwise there could be connection leaks.

Question: 1

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create an application. The application contains the following code segment. (Line numbers are included for reference only.)

01 class DataAccessLayer

02 {

03 private static string connString;

04

05 …

06 public static DataTable GetDataTable(string command){

07

08 …

09 }

10 }

You need to define the connection life cycle of the DataAccessLayer class. You also need to ensure that the application uses the minimum number of connections to the database. What should you do?

  1. Insert the following code segment at line 04.

private static SqlConnection conn = new SqlConnection(connString);

public static void Open(){

conn.Open();

}

public static void Close(){

conn.Close();

}

B.Insert the following code segment at line 04.

private SqlConnection conn = new SqlConnection(connString);

public void Open(){

conn.Open(); }

public void Close(){

conn.Close();

}

C.Replace line 01 with the following code segment.

class DataAccessLayer : IDisposable

Insert the following code segment to line 04.

private SqlConnection conn = new SqlConnection(connString);

public void Open(){

conn.Open();

}

public void Dispose(){

conn.Close();

}

D.Insert the following code segment at line 07.

using (SqlConnection conn = new SqlConnection(connString)){

conn.Open();

}


Answer: D

Explanation:

One thing you should always do is to make sure your connections are always opened within a using statement.

Using statements will ensure that even if your application raises an exception while the connection is open, it will always be closed

(returned to the pool) before your request is complete. This is very important, otherwise there could be connection leaks.

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Question: 1

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create an application. The application contains the following code segment. (Line numbers are included for reference only.)

01 class DataAccessLayer

02 {

03 private static string connString;

04

05 …

06 public static DataTable GetDataTable(string command){

07

08 …

09 }

10 }

You need to define the connection life cycle of the DataAccessLayer class. You also need to ensure that the application uses the minimum number of connections to the database. What should you do?

  1. Insert the following code segment at line 04.

private static SqlConnection conn = new SqlConnection(connString);

public static void Open(){

conn.Open();

}

public static void Close(){

conn.Close();

}

B.Insert the following code segment at line 04.

private SqlConnection conn = new SqlConnection(connString);

public void Open(){

conn.Open(); }

public void Close(){

conn.Close();

}

C.Replace line 01 with the following code segment.

class DataAccessLayer : IDisposable

Insert the following code segment to line 04.

private SqlConnection conn = new SqlConnection(connString);

public void Open(){

conn.Open();

}

public void Dispose(){

conn.Close();

}

D.Insert the following code segment at line 07.

using (SqlConnection conn = new SqlConnection(connString)){

conn.Open();

}


Answer: D

Explanation:

One thing you should always do is to make sure your connections are always opened within a using statement.

Using statements will ensure that even if your application raises an exception while the connection is open, it will always be closed

(returned to the pool) before your request is complete. This is very important, otherwise there could be connection leaks.

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Question: 4

You use Microsoft .NET Framework 4 to develop an application that connects to a Microsoft SQL Server 2008 database by using SQL Server authentication. The application contains the following connection string. SERVER=DBSERVER-01; DATABASE=pubs; uid=sa; pwd=secret; You need to ensure that the password value in the connection string property of a SqlConnection object does not exist after the Open method is called. What should you add to the connection string?

  1. Persist Security Info=True
  2. Trusted_Connection=True
  3. Persist Security Info=False
  4. Trusted_Connection=False


Answer: C

Explanation:

The Persist Security Info property specifies whether the data source can persist sensitive authentication information such as a password.

Persist Security Info Property

(http://msdn.microsoft.com/en-us/library/aa214039(v=sql.80).aspx)

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Question: 1

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create an application. The application contains the following code segment. (Line numbers are included for reference only.)

01 class DataAccessLayer

02 {

03 private static string connString;

04

05 …

06 public static DataTable GetDataTable(string command){

07

08 …

09 }

10 }

You need to define the connection life cycle of the DataAccessLayer class. You also need to ensure that the application uses the minimum number of connections to the database. What should you do?

  1. Insert the following code segment at line 04.

private static SqlConnection conn = new SqlConnection(connString);

public static void Open(){

conn.Open();

}

public static void Close(){

conn.Close();

}

B.Insert the following code segment at line 04.

private SqlConnection conn = new SqlConnection(connString);

public void Open(){

conn.Open(); }

public void Close(){

conn.Close();

}

C.Replace line 01 with the following code segment.

class DataAccessLayer : IDisposable

Insert the following code segment to line 04.

private SqlConnection conn = new SqlConnection(connString);

public void Open(){

conn.Open();

}

public void Dispose(){

conn.Close();

}

D.Insert the following code segment at line 07.

using (SqlConnection conn = new SqlConnection(connString)){

conn.Open();

}


Answer: D

Explanation:

One thing you should always do is to make sure your connections are always opened within a using statement.

Using statements will ensure that even if your application raises an exception while the connection is open, it will always be closed

(returned to the pool) before your request is complete. This is very important, otherwise there could be connection leaks.

Question: 1

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create an application. The application contains the following code segment. (Line numbers are included for reference only.)

01 class DataAccessLayer

02 {

03 private static string connString;

04

05 …

06 public static DataTable GetDataTable(string command){

07

08 …

09 }

10 }

You need to define the connection life cycle of the DataAccessLayer class. You also need to ensure that the application uses the minimum number of connections to the database. What should you do?

  1. Insert the following code segment at line 04.

private static SqlConnection conn = new SqlConnection(connString);

public static void Open(){

conn.Open();

}

public static void Close(){

conn.Close();

}

B.Insert the following code segment at line 04.

private SqlConnection conn = new SqlConnection(connString);

public void Open(){

conn.Open(); }

public void Close(){

conn.Close();

}

C.Replace line 01 with the following code segment.

class DataAccessLayer : IDisposable

Insert the following code segment to line 04.

private SqlConnection conn = new SqlConnection(connString);

public void Open(){

conn.Open();

}

public void Dispose(){

conn.Close();

}

D.Insert the following code segment at line 07.

using (SqlConnection conn = new SqlConnection(connString)){

conn.Open();

}


Answer: D

Explanation:

One thing you should always do is to make sure your connections are always opened within a using statement.

Using statements will ensure that even if your application raises an exception while the connection is open, it will always be closed

(returned to the pool) before your request is complete. This is very important, otherwise there could be connection leaks.

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