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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 conceptual schema definition language (CSDL) file contains the following XML fragment.
<EntityType Name="Contact"> ... <Property Name="EmailPhoneComplexProperty"
Type="AdventureWorksModel.EmailPhone" Nullable="false" />
</EntityType>
...
<ComplexType Name="EmailPhone">
<Property Type="String" Name="EmailAddress" MaxLength="50" FixedLength="false" Unicode="true" />
<Property Type="String" Name="Phone" MaxLength="25" FixedLength="false" Unicode="true" /> </ComplexType>
You write the following code segment. (Line numbers are included for reference only.)
01 using (EntityConnection conn = new EntityConnection("name=AdvWksEntities"))
02 {
03 conn.Open();
04 string esqlQuery = @"SELECT VALUE contacts FROM
05 AdvWksEntities.Contacts AS contacts
06 WHERE contacts.ContactID == 3";
07 using (EntityCommand cmd = conn.CreateCommand())
08 {
09 cmd.CommandText = esqlQuery;
10 using (EntityDataReader rdr = cmd.ExecuteReader())
11 {
12 while (rdr.Read())
13
{
14
...
15
}
16
}
17
}
18 conn.Close(); 19 }
You need to ensure that the code returns a reference to a ComplexType entity in the model named
EmailPhone.
Which code segment should you insert at line 14?

A) IExtendedDataRecord record = rdr["EmailPhone"]as IExtendedDataRecord; int FldIdx = 0; return record.GetValue(FldIdx);
B) int FldIdx = 0; EntityKey key = record.GetValue(FldIdx) as EntityKey; foreach (EntityKeyMember keyMember in key.EntityKeyValues)
{
return keyMember.Key + " : " + keyMember.Value;
}
C) DbDataRecord nestedRecord = rdr["EmailPhoneComplexProperty"] as DbDataRecord; return nestedRecord;
D) int fieldCount = rdr["EmailPhone"].DataRecordInfo.FieldMetadata.Count; for (int FldIdx = 0; FldIdx < fieldCount; FldIdx++) {
rdr.GetName(FldIdx);
if (rdr.IsDBNull(FldIdx) == false)
{
return rdr["EmailPhone"].GetValue(FldIdx).ToString();
}
}

2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
You create a Database Access Layer (DAL) that is database-independent. The DAL includes the following
code segment.
(Line numbers are included for reference only.)
01 static void ExecuteDbCommand(DbConnection connection)
02 {
03 if (connection != null){
04 using (connection){
05 try{
06 connection.Open();
07 DbCommand command = connection.CreateCommand();
08 command.CommandText = "INSERT INTO Categories (CategoryName)
VALUES ('Low Carb')";
09 command.ExecuteNonQuery();
10 }
11 ...
12 catch (Exception ex){
13 Trace.WriteLine("Exception.Message: " + ex.Message);
14 }
15 }
16 }
17 }
You need to log information about any error that occurs during data access.
You also need to log the data provider that accesses the database. Which code segment should you insert
at line 11?

A) catch (OleDbException ex){ Trace.WriteLine("ExceptionType: " + ex.InnerException.Source);
Trace.WriteLine("Message: " + ex.InnerException.Message);
}
B) catch (DbException ex){ Trace.WriteLine("ExceptionType: " + ex.InnerException.Source);
Trace.WriteLine("Message: " + ex.InnerException.Message);
}
C) catch (OleDbException ex){ Trace.WriteLine("ExceptionType: " + ex.Source);
Trace.WriteLine("Message: " + ex.Message);
}
D) catch (DbException ex){ Trace.WriteLine("ExceptionType: " + ex.Source);
Trace.WriteLine("Message: " + ex.Message);
}

3. You use Microsoft .NET Framework 4.0 to develop an application that connects to two separate Microsoft
SQL Server 2008 databases.
The Customers database stores all the customer information, and the Orders database stores all the order
information.
The application includes the following code. (Line numbers are included for reference only.)
01 try
02 {
03 conn.Open();
04 tran = conn.BeginTransaction("Order");
05 SqlCommand cmd = new SqlCommand();
06 cmd.Connection = conn;
07 cmd.Transaction = tran;
08 tran.Save("save1");
09 cmd.CommandText = "INSERT INTO [Cust].dbo.Customer " + "(Name,
PhoneNumber) VALUES ('Paul Jones', " + "'404-555-1212')";
10 cmd.ExecuteNonQuery();
11 tran.Save("save2");
12 cmd.CommandText = "INSERT INTO [Orders].dbo.Order " + "(CustomerID)
VALUES (1234)";
13 cmd.ExecuteNonQuery();
14 tran.Save("save3");
15 cmd.CommandText = "INSERT INTO [Orders].dbo." + "OrderDetail (OrderlD,
ProductNumber) VALUES" + "(5678, 'DC-6721')";
16 cmd.ExecuteNonQuery();
17 tran.Commit();
18 }
19 catch (Exception ex)
20 {
21 ...
22 }
You run the program, and a timeout expired error occurs at line 16. You need to ensure that the customer
information is saved in the database.
If an error occurs while the order is being saved, you must roll back all of the order information and save the
customer information.
Which line of code should you insert at line 21?

A) tran.Rollback("save2"); tran.Commit();
B) tran.Rollback(); tran.Commit();
C) tran.Rollback("save2");
D) tran.Rollback();

4. You use Microsoft .NET Framework 4.0 to develop an application that exposes a WCF Data Services
endpoint.
The endpoint uses an authentication scheme that requires an HTTP request that has the following header
format.
GET /OData.svc/Products(1)
Authorization: WRAP access_token "123456789"
You add the following method to your DataService implementation.
01 protected override void OnStartProcessingRequest(ProcessRequestArgs args)
02 {
03 ....
04 }
You need to ensure that the method retrieves the authentication token. Which line of code should you use?

A) string token = args.OperationContext.RequestHeaders["WRAP access_token"];
B) string token = args.OperationContext.RequestHeaders["Authorization"];
C) string token = args.OperationContext.ResponseHeaders["WRAP access_token"];
D) string token = args.OperationContext.ResponseHeaders["Authorization"];

5. The user interface requires that a paged view be displayed of all the products sorted in alphabetical order.
The user interface supplies a current starting index and a page size in variables named startIndex and
pageSize of type int.
You need to construct a LINQ expression that will return the appropriate Parts from the database from an
existing
ContosoEntities context object named context. You begin by writing the following expression:
context.Parts
Which query parts should you use in sequence to complete the expression?
(To answer, move the appropriate actions from the list of actions to the answer area and arrange them in
the correct order.)

A) .Skip(pageSize)
B) .OrderBy(x => x.Name)
C) .Take(pageSize);
D) .Skip(startIndex)
E) .Take(startIndex)

Solutions: