To avoid writing additional SQL statements to update a live database, you instantiate an object of which class?

Related MCQs

• Which of the following statements are correct? 1. Instance members of a class can be accessed only through an object of that class. 2. A class can contain only instance data and instance member function. 3. All objects created from a class will occupy equal number of bytes in memory. 4. A class can contain Friend functions. 5. A class is a blueprint or a template according to which objects are created.
• Which of the following statements are correct about an ArrayList collection that implements the IEnumerable interface? 1. The ArrayList class contains an inner class that implements the IEnumerator interface. 2. An ArrayList Collection cannot be accessed simultaneously by different threads. 3. The inner class of ArrayList can access ArrayList class's members. 4. To access members of ArrayList from the inner class, it is necessary to pass ArrayList class's reference to it. 5. Enumerator's of ArrayList Collection can manipulate the array.
• Which of the following statements are correct? 1. We can assign values of any type to variables of type object. 2. When a variable of a value type is converted to object, it is said to be unboxed. 3. When a variable of type object is converted to a value type, it is said to be boxed. 4. Boolean variable cannot have a value of null. 5. When a value type is boxed, an entirely new object must be allocated and constructed.
• Which of the following statements are correct about the delegate declaration given below? delegate void del(int I); 1. On declaring the delegate a class called del will get created. 2. The signature of del need not be same as the signature of the method that we intend to call using it. 3. The del class will be derived from the MulticastDelegate class. 4. The method that can be called using del should not be a static method. 5. The del class will contain a one-argument constructor and an lnvoke() method.
• A class implements two interfaces each containing three methods. The class contains no instance data. Which of the following correctly indicate the size of the object created from this class?
• In Visual Studio, the tool that enables you to connect to a database and automatically populate a dataset object using a TableAdapter object is the ___________wizard:
• Which of the following can be facilitated by the Inheritance mechanism? 1. Use the existing functionality of base class. 2. Overrride the existing functionality of base class. 3. Implement new functionality in the derived class. 4. Implement polymorphic behaviour. 5. Implement containership.
• Which of the following can be facilitated by the Inheritance mechanism? 1 Use the existing functionality of base class. 2 Overrride the existing functionality of base class. 3 Implement new functionality in the derived class. 4 Implement polymorphic behaviour. 5 Implement containership.
• Which of the following statements are correct about exception handling in C#.NET? 1 If an exception occurs then the program terminates abruptly without getting any chance to recover from the exception. 2 No matter whether an exception occurs or not, the statements in the finally clause (if present) will get executed. 3 A program can contain multiple finally clauses. 4 A finally clause is written outside the try block. 5 Finally clause is used to perform cleanup operations like closing the network/database connections.
• Which of the following statements are correct about arrays used in C#.NET? 1. Arrays can be rectangular or jagged. 2. Rectangular arrays have similar rows stored in adjacent memory locations. 3. Jagged arrays do not have an access to the methods of System.Array Class. 4. Rectangular arrays do not have an access to the methods of System.Array Class. 5. Jagged arrays have dissimilar rows stored in non-adjacent memory locations.