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Mcq Answers for C#

Which of the following code samples show a valid static constructor?

  1. class Sample 
{    
 public static Sample()    
 {    
 } 
}

  2. class Sample 
{    
 static Sample()    
 {    
 } 
}

  3. class Sample 
{    
 static Sample(int value)
 {    
 } 
}

  4. class Sample 
{    
 static void Sample()
 {    
 } 
}
Answer: Answer is b
Further Reading:

Useful resources, Static Constructors

Which of the following does the System.IO.Pipes namespace provide?

  1. Interprocess communication through anonymous and/or named pipes.

  2. Access to named pipes using System.IO.Stream

  3. Access to system level pipe security implemented as discretionary access control lists (DACL) and/or system access control lists (SACL)

  4. Asynchronous read and write operations

  5. All of the above

Answer: Answer is e
Further Reading:

Useful resources, Pipe Operations, System.IO.Pipes, Named Pipe Security and Access Rights, PipeSecurity

Which of the following characteristics are found in a query expression?

  1. It must begin with a from clause

  2. It must begin with a select clause

  3. It can end with a group clause

  4. It must contain at least one where clause

  5. An orderby clause may optionally follow a select clause

Answer: Answer is a, c
Further Reading:

A query expression must begin with a from clause and must end with a select or group clause. Between the first from clause and the last select or group clause, it can contain one or more of these optional clauses: where, orderby, join, let and even additional from clauses. You can also use the into keyword to enable the result of a join or group clause to serve as the source for additional query clauses in the same query expression. Useful resources, Query Expression Basics

Which of the following statements do Expression Trees fit best?

  1. Expression trees are a data structure which can be initially composed using language syntax.

  2. Expression trees are dynamically generated code which is executed to perform the desired function.

  3. Expression trees can only be created from Lambda Expressions

  4. Expression trees can be modified once they are created

  5. All of the Above

Answer: Answer is e
Further Reading:

Useful resources, Expression Trees

Which of the following are true about declarative attributes?

  1. They must be inherited from the System.Attribute

  2. Attributes are instantiated at the same time as instances of the class to which they are applied.

  3. Attribute classes may be restricted to be applied only to application element types.

  4. By default, a given attribute may be applied multiple times to the same application element.

Answer: Answer is a, d
Further Reading:

All attribute types derive directly or indirectly from the Attribute class. Attributes can be applied to any target element; multiple attributes can be applied to the same target element; and attributes can be inherited by an element derived from a target element. Use the AttributeTargets class to specify the target element to which the attribute is applied. Useful resources, Attribute Class , Attribute

When Deleting a DataRow from the DataRowCollection of a DataTable, you can?

  1. Use the DataRowCollection.Remove method to immediately delete  the row.

  2. use the DataRowCollection.Remove method to mark the row for deletion when DataRow.AcceptChanges is called.

  3. use the DataRow.Delete method to immediately delete  the row

  4. use the DataRow.Delete method to mark the row for deletion when DataRowAcceptChanges is called.

Answer: Answer is a, d
Further Reading:

Useful resources, DataRow , DataRowCollection, DataRow.Delete Method

Which of the following advantages does System.Collections.IDictionaryEnumerator provide over System.Collections.IEnumerator?

  1. It adds properties for direct access to both the Key and the Value

  2. It is optimized to handle the structure of a Dictionary.

  3. It provides properties to determine if the Dictionary is enumerated in Key or Value order

  4. It provides reverse lookup methods to distinguish a Key from a specific Value

Answer: Answer is a
Further Reading:

Useful resources, IEnumerator, IDictionaryEnumerator,stackoverflow answer

Within Windows Workflow Foundation, Compensating Actions are used for?

  1. provide a means to rollback a failed transaction

  2. provide a means to undo a successfully committed transaction later

  3. provide a means to terminate an in process transaction

  4. achieve load balancing by adapting to the current activity

Answer: Answer is b
Further Reading:

Compensation in Windows Workflow Foundation (WF) is the mechanism by which previously completed work can be undone or compensated. Useful resources, Compensation

To which of the following can System.IO.IsolatedStorage not be scoped?

  1. Restricted to a Specific Application

  2. Restricted to a Specific AppDomain

  3. Restricted to a Specific User

  4. Restricted to a specific Physical Media

Answer: Answer is d
Further Reading:

Useful resources, System.IO.IsolatedStorage, Isolated Storage

Which of the following regarding the System.DateTimeOffset structure are true?

  1. It provides an exact point in time relative to the UTC time zone

  2. It combines a DateTime structure with a TimeZone structure

  3. It provides arithmetical operations using values with different offsets from the UTC

  4. It can be used to determine the specific TimeZone for a local time

Answer: Answer is a, c
Further Reading:

Useful resources, DateTimeOffsetStructure

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