DotNet Interview Questions

i18N concepts

2012-11-05T05:58:00.001-08:00

What is the difference between Unicode and UTF-16?
What is the significance of UTF-8? When to use it?
If Chinese characters are represented as 2 or 3 bytes, how will you find out the length of a string in Chinese? For e.g. for validating the length of a field on a form.
When do we need to use Base64 encoding?
If I need to make an application i18n enabled, besides label/message strings, what are the other areas (data-points) I need to take care of?
Can you open an unicode file (containing CJK chars) in notepad? If not, then why? What editors support unicode on your desktop?

Security concepts

2012-11-05T05:53:00.006-08:00

What is the difference between pseudo-random numbers and real random numbers? PRNG and TRNG...
Is it even possible to create a true random number?
Why are random numbers important in cryptography?
What is the difference between hashing and encryption?
When would you use symmetric vs asymmetric encryption?
Does SSL / HTTPS use symmetric key or asymmetric key? What is session key?
What do you mean by 128-bit encryption? Is it the size of the symmetric key or asymmetric key?
What is the difference between digital signature and digital certificate?
What does a digital certificate contain? Also please explain how this all relates to the "Chain of Responsibility" design pattern?
What's the difference between a GUID generator and a random number generator?
When you install a digital certificate on the server, where is the private key stored?
What digital certs are installed on your brower? Who installs them and why are they required?

Sample scenarios: What to do? Whose public / private key to use?

You want to send a encrypted message to a person
You want to digitally sign a document/message

2005-12-05T01:13:00.000-08:00

- What's the difference btw a DataReader and a DataSet?
- When would U use a DataReader instead of a DataSet ?
- How is a DataSet populated ? Is a DataReader used behind the scenes ?
- How is a database Cursor linked to a DataReader ?

2005-10-19T06:27:00.000-07:00

Can a single ASP.NET application have 2 different authentication modes specified in 2 different web.config files?

If Cookies is disabled, then can Forms authentication work?

2005-10-19T04:42:00.000-07:00

How do I create a multilanguage, multifile assembly?
Why cannot you specify the accessibility modifier for methods inside the interface?

2005-10-07T01:25:00.000-07:00

How are the activation URLs different in case of SAO and CAO in .NET remoting?

2005-10-07T01:24:00.000-07:00

When will U use a XMLDataDocument and when will U use a XPathDocument? What's the differences btw the two?

When will U use a XMLReader class? What's the difference btw 'pull' model and 'SAX event-driven' push model of XML parsing?

2005-10-03T06:03:00.000-07:00

What are 'Principles' and 'Identities' in .NET ?

How can these be used for authentication and authorization?

2005-10-03T04:32:00.000-07:00

How would U create a user-control?
What basic steps are required to create a custom webcontrol?

2005-10-03T04:08:00.000-07:00

In web applications what's the difference btw authentication and authorization?

What are the different ways of authentication in ASP.NET ?

Scenario: At runtime, whenever the user requests a change in some settings, I update the web.config file dynamically at runtime to store the config values. But I notice that my session state gets lost. Why does this occur?

U want to control anonymous user's access to resources on the server. How would U do it? (Hint: Which user account would U modify? )

2005-10-03T03:36:00.000-07:00

How would U add a client side script for a web-control in ASP.NET ?

Can U raise a post-back event for a custom control?...Say U have a link and U want a post-back event to be raised when the link is clicked.

What's the difference btw a 'HyperLink' and a 'LinkButton' ?

2005-10-03T03:35:00.000-07:00

What is the 'Item' property in C#. How does one access the Item property in C#.NET ?

2005-10-03T03:33:00.000-07:00

What's the difference between 'const' and 'static readonly' in C#.NET ?

How would U mark a method as obsolete in C#.NET. Say U want a compiler error to be generated whenever someone uses a obsolete version of you API....Can this be done?

2005-09-23T05:46:00.000-07:00

What's the difference btw the following methods in .NET remoting?

RegisterWellknownServiceType()
RegisterWellknownClientType()
RegisterActivatedServiceType()
RegisterActivatedClientType()

2005-09-20T00:50:00.000-07:00

Visual Studio Questions:
---------------------------
1) Can U debug JavaScript or VBScript code using VS ?
2) When I debug a ASP.NET application, IE opens by default. How can I change the browser?
3) Can U debug ASP.NET applications remotely? i.e. Ur application is running on a different server and U have VS.NET on Ur m/c ?
4) How would U do "Production Debugging" in ASP.NET?

2005-07-14T23:22:00.000-07:00

Can U debug (generate debug information/symbols) in Release mode?
Is the size of a .NET dll/assembly same in Debug and Release mode?
While debugging, I see the VS.NET pointer skipping some lines.Why ?

2005-07-12T02:40:00.000-07:00

What is thread-pool starvation in ASP.NET and when does it occur?

.NET Remoting Questions Contd.

2005-07-11T23:03:00.000-07:00

What is a sink? What are message sinks, channel sinks, transport sinks?

Can I use SoapSuds.exe to access a Webservice?

How can I control the lifetime of SAO Single-Call objects?

Can a SAO have a non-default parameter constructor? Why?

When would U override the InitializeLifetimeService() method?

How can a client increase the lease time of a remote object?

Why does a Sponsor class need to extend MarshalByRef? Who controls the life-time of the sponsor?

.NET Remoting Questions

2005-07-11T02:32:00.000-07:00

In .NET webservices, we can create a proxy class by either adding a web-reference in VS.NET or using the WSDL.exe tool from the command prompt. Who creates the proxy classes in .NET remoting?

What are well-known types in .NET remoting?

We have 2 methods of Activator -- GetObject() {Used for Server-activated objects}
and CreateInstance() { Used for client activated objects }
When do we use the 'new' operator ?

What are the advantages/disadvantages of using programmatic configuration of remoting data Vs config files?

When do we need to override the InitializeLifetimeService() method?

How are Life-times managed in a .NET remoting distibuted environment?

When would U use the SoapSuds.exe utility?

What's the difference between the Soapsuds.exe and Wsdl.exe tools? (Both of them are used to generate proxies for web-services)

Is it possible to have a binary formatter for a HTTP channel?

Can I use SoapSuds.exe for a Tcp channel? For a CAO?

What network calls happen when Activator.GetObject() is called for a SAO?

Can I pass parameters to the constructor of a CAO?

2005-07-09T03:20:00.000-07:00

In COM interop, what's the difference between "tlbexp" and "regasm" tools?

2005-07-08T04:13:00.000-07:00

How would U maintain data-concurrency in ADO.NET?
Please explain the common techniques.

2005-07-08T04:03:00.000-07:00

What are the different transaction isolation levels and when to use what?
What does the isolation level 'Any' mean?

2005-06-30T05:50:00.000-07:00

What's the advantage of using strongly typed datasets in ADO.NET?

2005-06-27T07:46:00.000-07:00

A circular project dependency occurs when two or more projects depend on each other. For example: FileOne in ProjectA depends on FileTwo in ProjectB, and FileThree in ProjectB depends on FileFour back in ProjectA.

How will U solve such dependencies in VS.NET ?

2005-06-22T23:14:00.000-07:00

Suppose U have a file that needs to be shared between a .NET application and a non-.NET application for writing/reading. How will U do it ?