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PROGRAM
BACHELOR OF COMPUTER APPLICATION
SEMESTER
5
SUBJECT CODE & NAME
BCA5020- VISUAL PROGRAMMING
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
Qus:2 Briefly
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 [ Step step ]
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
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
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
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.
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