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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 connects to a Microsoft SQL Server database. You use the ADO.NET LINQ to Entity model
to retrieve data from the database.
You need to call a function that is defined in the conceptual model from within the LINQ to Entities queries.
You create a common language runtime (CLR) method that maps to the function. What should you do
next?
A) Declare the method as static.
B) Apply the EdmFunctionAttribute attribute to the method.
C) Declare the method as abstract.
D) Apply the EdmComplexTypeAttribute attribute to the method.
2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application.
You use the ADO.NET Entity Framework Designer to model entities. You retrieve an entity from an object context.
A different application updates the database. You need to update the entity instance to reflect updated
values in the database.
Which line of code should you use?
A) context.LoadProperty(entity, "Server", MergeOption.OverwriteChanges);
B) context.Refresh(RefreshMode.StoreWins, entity);
C) context.LoadProperty(entity, "Client", MergeOption.OverwriteChanges);
D) context.AcceptAllChanges();
3. 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) SqlConnection conn = new SqlConnection(connString); conn.Open(); cmd.Connection = conn; cmd.CommandText = updateStmt; cmd.ExecuteNonQuery(); cmd.Connection.Close() ;
B) using (SqlConnection conn = new SqlConnection(connString))
{
conn.Open() ;
cmd.Connection = conn;
cmd.CommandText = updateStmt;
cmd.ExecuteNonQuery() ;
}
C) SqlConnection conn = new SqlConnection(connString); conn.Open(); cmd.Connection = conn; cmd.CommandText = updateStmt; cmd.ExecuteNonQuery();
D) using (SqlConnection conn = new SqlConnection(connString))
{
cmd.Connection = conn;
cmd.CommandText = updateStmt;
cmd.ExecuteNonQuery();
cmd.Connection.Close();
}
4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create a Microsoft ASP.NET
application.
The application connects to a Microsoft SQL Server database. The application is hosted on a Web server
along with other applications.
You need to secure the transmission of data between the application and the database.
You need to achieve this goal without affecting other applications. What should you do?
A) Encrypt the connection string.
B) Use encryption to store sensitive data in the database.
C) Use Secure Sockets Layer (SSL) to establish connections to the database.
D) Use Internet Protocol Security (IPSec) to secure the communication channel.
5. 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.Field<string>("ContactName") != null select row;
B) from row in ds.Tables[0].AsEnumerable() where !Convert.IsDBNull(row.Field<string>("ContactName")) select row;
C) from row in ds.Tables[0].AsEnumerable() where (string)row["ContactName"] != null select row;
D) from row in ds.Tables[0].AsEnumerable() where !row.IsNull((string)row["ContactName"]) select row;
Solutions:
Question # 1 Answer: B | Question # 2 Answer: B | Question # 3 Answer: B | Question # 4 Answer: C | Question # 5 Answer: A |