BCA5020- VISUAL PROGRAMMING


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PROGRAM
BACHELOR OF COMPUTER APPLICATION
SEMESTER
5
SUBJECT CODE & NAME


Qus:1 Explain the concept of Overriding in VB.net.
Answer: Access modifiers will fix the accessibility levels of the data member and member function of the class. Means to what extend the members of the class will be accessible or visible. Following are the list of access levels that the VB .NET supports.
 Public
 Private
 Protected

Qus:2Briefly explain the “For Next” loop in VB.net with an example.
Answer: This loop executes for single or group of statements for a specified number of times, here the loop index counts the number of iterations. This loop can be terminated at any point of time using Exit For statement.
For counter [ As datatype ] = start To end [




Qus:3 What are the advantages of event driven programming?
Answer: In event driven or event based programming the flow of program is determined by events. It relies on events, triggers and handlers, program executed based on the event will be triggered by the GUI elements. Event driven programming can also be defined as an application architecture technique here the application has a main loop and further it has been divided in to two sections.




Qus:4 What is delegates? Explain the role of delegates on VB .NET
Answer: A delegate can be defined as a “type safe function pointer”. It encapsulates the memory address of a function in your code. Whenever you create or use an event in code, you are using a delegate. When the event is thrown, the framework examines the delegate behind the event and then calls thefunction



Qus:5 Discuss the following
a. SQLDataAdapter
 b. DataSet class
Answer: a. SQLDataAdapter
The DataAdapter is an interface between the database and the dataset. It is located between the connected and disconnected parts of Ado.Net as a connector. DataAdapter class will be instantiated by the constructor that are generally overloaded. If we use the default constructor for the DataAdapter, we need to specify


Qus:6 Explain Features of Android Operating system
Answer:Handset layouts: The platform is adaptable to higher, VGA (Video Graphics Array), 2D graphics library, 3D graphics library based on OpenGL ES 2.0 specifications, and traditional smartphone layouts.
Storage: SQLite is one of the lightweight relational databases, used in Android platform that makes the data storage more easy and comfortable. Connectivity: Android supports a connectivity technology that includes IDEN NFC, GSM/EDGE, Bluetooth, CDMA, EV-DO, UMTS, WiMAX., Wi-Fi, LTE, etc.
Messaging: The two major forms of message availability are in the forms of SMS (Shot Message Service) and MMS (Multimedia


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