Microsoft 070-516 : TS: Accessing Data with Microsoft .NET Framework 4

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

1. You are developing a new feature in the application to display a list of all bundled products.
You need to write a LINQ query that will return a list of all bundled products. Which query expression should
you use?

A) context.Parts.OfType<Product>() .ToList() .Where(p => p.Descendants.Any(d => d is Product))
B) context.Parts.Cast<Product>() .ToList() .Where(p => p.Descendants.Any(d => d is Product))
C) context.Parts.OfType<Product>() .Where(p => p.Descendants.Any(d => d is Product))
D) context.Parts.Cast<Product>() .Where(p => p.Descendants.Any(d => d is Product))

2. 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) 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) SqlConnection conn = new SqlConnection(connString); conn.Open(); cmd.Connection = conn; cmd.CommandText = updateStmt; cmd.ExecuteNonQuery(); cmd.Connection.Close() ;

3. You use Microsoft .NET Framework 4.0 to develop an application that uses LINQ to SQL.
The Product entity in the LINQ to SQL model contains a field named Productlmage. The Productlmage field
holds a large amount of binary data.
You need to ensure that the Productlmage field is retrieved from the database only when it is needed by the
application. What should you do?

A) When the context is initialized, specify that the Productlmage property should not be retrieved by using DataLoadOptions
B) Set the Auto-Sync property on the Productlmage property of the Product entity to Never.
C) Set the Update Check property on the Productlmage property of the Product entity to Never.
D) Set the Delay Loaded property on the Productlmage property of the Product entity to True.

4. 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 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();
}
}
C) DbDataRecord nestedRecord = rdr["EmailPhoneComplexProperty"] as DbDataRecord; return nestedRecord;
D) int FldIdx = 0; EntityKey key = record.GetValue(FldIdx) as EntityKey; foreach (EntityKeyMember keyMember in key.EntityKeyValues)
{
return keyMember.Key + " : " + keyMember.Value;
}

5. You develop a Microsoft .NET application that uses Entity Framework to store entities in a Microsft SQL
Server 2008 database.
While the application is disconnected from the database, entities that are modified, are serialized to a local
file.
The next time the application connects to the database, it retrieves the identity from the database by using
an object context
named context and stores the entity in a variable named remoteCustomer.
The application then serializes the Customer entity from the local file and stores the entity in a variable
named localCustomer.
The remoteCustomer and the localCustomer variables have the same entity key.
You need to ensure that the offline changes to the Customer entity is persisted in the database when the
ObjectContext.SaveChanges() method is called.
Which line of code should you use?

A) context.ApplyCurrentValues("Customers", localCustomer);
B) context.ApplyOriginalValues("Customers", remoteCustomer);
C) context.ApplyOriginalValues("Customers", localCustomer);
D) context.ApplyCurrentValues("Customers", remoteCustomer);

Solutions: