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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 configuration file contains the following code segment.
<configuration> <connectionStrings> <add name="AdventureWorksLT" connectionString="DataSource=SQL01;InitialCatalog=AdventureWorksLT; IntegratedSecurity=True;" providerName="System.Data.SqlClient"/> </connectionStrings> </configuration>
You need to retrieve the connection string named AdventureWorksLT from the configuration file. Which line of code should you use?

A) varconnectionString=ConfigurationManager.ConnectionStrings["AdventureWorksLT"].ConnectionString;
B) varconnectionString=ConfigurationManager.AppSettings["AdventureWorksLT"];
C) varconnectionString=ConfigurationManager.ConnectionStrings["AdventureWorksLT"].Name;
D) varconnectionString=ConfigurationSettings.AppSettings["AdventureWorksLT"];

2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application. You use the ADO.NET Entity Framework to model entities. You write the following code segment. (Line numbers are included for reference only.)
01 AdventureWorksEntities context = new AdventureWorksEntities("http://
localhost:1234/AdventureWorks.svc");
02 ...
03 var q = from c in context.Customers
04 where c.City == "London"
05 orderby c.CompanyName
06 select c;
You need to ensure that the application meets the following requirements:
-Compares the current values of unmodified properties with values returned from the data source.
-Marks the property as modified when the properties are not the same. Which code segment should you insert at line 02?

A) context.MergeOption = MergeOption.OverwriteChanges;
B) context.MergeOption = MergeOption.PreserveChanges;
C) context.MergeOption = MergeOption.NoTracking;
D) context.MergeOption = MergeOption.AppendOnly;

3. The application user interface displays part names or color names in many plases as '## Name ##'.
You need to provide a method named FormattedName() to format part names and color names throughout
the
application. What should you do?

A) Add the following code segmend to the Part class in Part.cs:
public string FormattedName(){
return string.Format("## {0} ##", this.Name);
}
B) Add the following code segment to the ExtensionMethods class in ExtensionMethods.cs:
public static string FormattedName (this Part entity){
return string.Format("## {0} ##", entity.Name)
}
C) Add the following code segmend to the Color class in Color.cs:
public string FormattedName(){
return string.Format("## {0} ##", this.Name);
}
D) Add the following code segment to the ExtensionMethods class in ExtensionMethods.cs:
public static string FormattedName (this Color entity){
return string.Format("## {0} ##", entity.Name)
}
E) Add the following code segment to the ExtensionMethods class in ExtensionMethods.cs:
public static string FormattedName (this IName entity){
return string.Format("## {0} ##", entity.Name)
}

4. 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.
The application uses a DataTable named OrderDetailTable that has the following columns:
-ID
-OrderID
-ProductID
-Quantity
-LineTotal
Some records contain a null value in the LineTotal field and 0 in the Quantity field. You write the following code segment. (Line numbers are included for reference only.)
01 DataColumn column = new DataColumn("UnitPrice", typeof(double));
02 ...
03 OrderDetailTable.Columns.Add(column);
You need to add a calculated DataColumn named UnitPrice to the OrderDetailTable object.
You also need to ensure that UnitPrice is set to 0 when it cannot be calculated.
Which code segment should you insert at line 02?

A) column.Expression = "iif(Quantity > 0, LineTotal/Quantity, 0)";
B) column.Expression = "LineTotal/ISNULL(Quantity, 1)";
C) column.Expression = "if(Quantity > 0, LineTotal/Quantity, 0)";
D) column.Expression = "LineTotal/Quantity";

5. You use Microsoft Visual Studio 2010 and the Microsoft .NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server database. The application uses DataContexts to query
the database.
You define a foreign key between the Customers and Orders tables in the database.
You need to ensure that when you delete a customer record, the corresponding order records are deleted.
You want to achieve this goal by using the minimum amount of development effort. What should you do?

A) Modify the foreign key between the Customers and Orders tables to enable the ON DELETE CASCADE option.
B) Override the Delete operation of the customer entity.
C) Remove the foreign key between the Customers and Orders tables.
D) Use the ExecuteDynamicDelete method of the DataContext object.

Solutions: