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Visual Basic Interview Questions and Answers
What are some benefits of using MTS?
Database Pooling, Transactional operations, Deployment,
Security, Remote Execution.
What is the benefit of wrapping database calls into MTS
transactions?
If database calls are made within the context of a
transaction, aborting the transaction will undo and
changes that occur within that transaction. This removes
the possibility of stranded, or partial data.
Describe and In Process vs. Out of Process component.
Which is faster?
An in-process component is implemented as a DLL, and
runs in the same process space as its client app,
enabling the most efficient communication between client
and component.Each client app that uses the component
starts a new instance of it.An out of process component
is implemented as an EXE, and unlike a dll, runs in its
own process space. As a result, exe’s are slower then
dll’s because communications between client and
component must be marshalled across process boundaries.
A single instance of an out of process component can
service many clients.
What are the main components of the ADO object model?
How are they used?
Connection: Used to make a connection between your app
and an external data source, ie, sql server.Command:
Used to build queries, including user-specific
parameters, to access records from a data source (which
are returned in a Recordset)Recordset:Used to access
records returned from an SQL query. With a recordset,
you can navigate returned records. You can also add,
modify or delete records.
Can We create CGI scripts in VB??
Yes.
Dim x, y as integer. What is x and y data type?
X as variant and y as integer.
What is Centralization Error Handling?
Writing function and calling it when error occurs.
What is frx?
When some controls like grid and third party control
placed in our application then it will create frx in run
time.
What is the Dll required for running the VB?
Vbrun300.dll
Why we use Treeview Control?
To list the hierarchical list of the node objects. Such
of files and Directories.
Handling Error in Calling chain.
This will call the top most error where the error is
handled.
In project properties if we set Unattended what is it
mean?
This cannot have user interface. This can be used for
the COM creation.
What is the size of the variant data type?
The Variant data type has a numeric storage size of 16
bytes and can contain data up to the range of a Decimal,
or a character storage size of 22 bytes (plus string
length),and can store any character text.
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