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Describe exception handling in VB.NET?

Posted By :Subhransu Sekhar Jena     Posted Date :October 31, 2014    Points :40   Category :VB.Net 
The Try block encapsulate set of code that is error prone and can throw exception. If an exception is thrown, it can be caught in an appropriate Catch (catch) block. You have Finally block that can contain code that must be executed even if no exception is handled.

You can also find related Interview Question to Describe exception handling in VB.NET?  below: 

Describe the three levels of data abstraction?

  
The are three levels of abstraction:
1.Physical level: The lowest level of abstraction describes how data are stored.

2.Logical level: The next higher level of abstraction, describes what data are stored in database and what relationship among those data.

3.View level: The highest level of abstraction describes only part of entire database. (More...)

Describe ways of cleaning up objects.

  
The run time will maintain a service called as garbage collector.
this service will take care of deallocating memory corresponding to
objects.it works as a thread with least priority.when application
demenads for memory the runtime will take care of setting the high
priority for the garbage collector,so that it will be called for execution
and memory will be released.the programmer can make a call
to garbage colector by using GC class in system name space. (More...)

Describe the techniques for optimising your application?

  
. Avoid round-trips to server. Perform validation on client.
. Save viewstate only when necessary.
. Employ caching.
. Leave buffering on unless there is a dire need to disable it.
. Use connection pooling.
. Use stored procedures instead of in-line SQL or dynamic SQL. (More...)

Can you describe IUKNOWN interface in short ?

  
Every COM object supports at least one interface, the IUnknown interface. All interfaces are classes derived from the base class IUnknown. Each interface supports methods access data and perform operations transparently to the programmer. For example, IUnknown supports three methods, AddRef, Release(), and QueryInterface(). Suppose that pinterf is a pointer to an IUnknown. pinterf->AddRef() increments the reference count. pinterf->Release() decrements the reference count, deleting the object when the reference count reaches zero. pinterf->QueryInterface( IDesired, pDesired) checks to see if the current interface (IUnknown) supports another interface, IDesired, creates an instance (via a call to CoCreateInstance()) of the object if the reference count is zero (the object does not yet exist), and then calls pDesired->AddRef() to increment the reference count (where pDesired is a pointer to IDesired) and returns the pointer to the caller. (More...)

What is transact-SQL? Describe its types?

  
Types of Transact-SQL:
----------------------
SQL Server Provides three types of Transact-SQL statements namely DDL, DCL, and DML.

Data Definition Language (DDL):
--------------------------------
It allows creating, altering and dropping database objects.

Data Control Language (DCL):
----------------------------
It is used to control access to data in the database.
It controls permission on the database objects using grant, revoke or deny statement.

Data Manipulation Language (DML):
--------------------------------
It involves retrieval, insertion, deletion, modification in the database.
It includes select, insert, update, and delete command. (More...)

Why is catch(Exception) almost always a bad idea?

  
Well, if at that point you know that an error has occurred, then why not write the proper code to handle that error instead of passing a new Exception object to the catch block? Throwing your own exceptions signifies some design flaws in the project. (More...)

Can you describe WCF ?

  
In Simple words, WPF stands for Windows Presentation Foundation.

In detailed view WPF is a new library to create the UI for smart client applications. Most noteable point is : application does not use Window handles. It is easy to resize the UI and supports sound video.


Definition of WPF is : Windows Presentation Foundation (WPF) is Microsoft's development tool for Web applications and rich client applications.With WPF, developers can use XAML, the Extensible Application Markup Language, to create custom controls, graphics, 3D images and animations that are not available in traditional HTML implementations. (More...)

Can you describe WPF?

  
In Simple words, WPF stands for Windows Presentation Foundation.

In detailed view WPF is a new library to create the UI for smart client applications. Most noteable point is : application does not use Window handles. It is easy to resize the UI and supports sound video.


Definition of WPF is : Windows Presentation Foundation (WPF) is Microsoft's development tool for Web applications and rich client applications.With WPF, developers can use XAML, the Extensible Application Markup Language, to create custom controls, graphics, 3D images and animations that are not available in traditional HTML implementations. (More...)

Describe the accessibility modifier protected internal.

  
It's available to derived classes and classes within the same Assembly. (More...)

Which class is the base class of all the exception classes?

  
System.Exception class is the base class of all the exception classes in .NET. (More...)

Which namespace is used to create an Exception Tree?

  
System.Data.Common.CommandTree namespace provide classes to create an Exception Tree. (More...)

Describe the difference between a list and a library in sharepoint?

  
Lists are collections of metadata or columns, that can have attached documents. Libraries are collections of documents (Excel, InfoPath, Word, etc.) plus optional metadata. (More...)

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