.NET Interview Questions

What is a IL?
Twist :- What is MSIL or CIL , What is JIT?
What is a CLR?
What is a CTS?
What is a CLS(Common Language Specification)?
What is a Managed Code?
What is a Assembly ?
What are different types of Assembly?
What is NameSpace?
What is Difference between NameSpace and Assembly?
If you want to view a Assembly how to you go about it ?
Twist : What is ILDASM ?
What is Manifest?
Where is version information stored of a assembly ?
Is versioning applicable to private assemblies?
What is GAC ?
Twist :- What are situations when you register .NET assembly in GAC ?
What is concept of strong names ?
Twist :- How do we generate strong names or what is the process of generating strong
names , What is use of SN.EXE , How do
we apply strong names to assembly ? , How do you sign an assembly ?
How to add and remove a assembly from GAC?
What is Delay signing ?

.NET Interview Questions

What is garbage collection?
Can we force garbage collector to run ?
What is reflection?
What are different type of JIT ?
What are Value types and Reference types ?
What is concept of Boxing and Unboxing ?
What’s difference between VB.NET and C# ?
What’s difference between System exceptions and Application exceptions?
What is CODE Access security?
What is a satellite assembly?
How to prevent my .NET DLL to be decompiled?
What’s the difference between Convert.toString and .toString() method ?
What is Native Image Generator (Ngen.exe)?
We have two version of the same assembly in GAC? I want my client to make choice of
which assembly to choose?
What is CodeDom?


.NET Interoperability

How can we use COM Components in .NET?
Twist : What is RCW ?
Once i have developed the COM wrapper do i have to still register the COM in registry?
How can we use .NET components in COM?
Twist :- What is CCW (COM callable wrapper) ?, What caution needs to be taken in order
that .NET components is compatible with COM ?
How can we make Windows API calls in .NET?
When we use windows API in .NET is it managed or unmanaged code ?
What is COM ?
What is Reference counting in COM ?
Can you describe IUKNOWN interface in short ?
Can you explain what is DCOM ?
How do we create DCOM object in VB6?
How to implement DTC in .NET ?
How many types of Transactions are there in COM + .NET ?
How do you do object pooling in .NET ?
What are types of compatibility in VB6?
What is equivalent for regsvr32 exe in .NET ?

Threading

What is Multi-tasking ?
What is Multi-threading ?
What is a Thread ?
Did VB6 support multi-threading ?
Can we have multiple threads in one App domain ?
Which namespace has threading ?
Can you explain in brief how can we implement threading ?
How can we change priority and what the levels of priority are provided by .NET ?
What does Addressof operator do in background ?
How can you reference current thread of the method ?
What's Thread.Sleep() in threading ?
How can we make a thread sleep for infinite period ?
What is Suspend and Resume in Threading ?
What the way to stop a long running thread ?
How do i debug thread ?
What's Thread.Join() in threading ?
What are Daemon thread's and how can a thread be created as Daemon?
When working with shared data in threading how do you implement synchronization ?
Can we use events with threading ?
How can we know a state of a thread?
What is a monitor object?
What are wait handles ?
Twist :- What is a mutex object ?
what is ManualResetEvent and AutoResetEvent ?
What is ReaderWriter Locks ?
How can you avoid deadlock in threading ?
What’s difference between thread and process?

Remoting and Webservices

What is a application domain?
What is .NET Remoting ?
Which class does the remote object has to inherit ?
What are two different types of remote object creation mode in .NET ?
Describe in detail Basic of SAO architecture of Remoting?
What are the situations you will use singleton architecture in remoting ?
What is fundamental of published or precreated objects in Remoting ?
What are the ways client can create object on server in CAO model ?
Are CAO stateful in nature ?
In CAO model when we want client objects to be created by “NEW” keyword is there
any precautions to be taken ?
Is it a good design practice to distribute the implementation to Remoting Client ?
What is LeaseTime,SponsorshipTime ,RenewonCallTime and LeaseManagerPollTime?
Which config file has all the supported channels/protocol ?
How can you specify remoting parameters using Config files ?
Can Non-Default constructors be used with Single Call SAO?
Twist :- What are the limitation of constructors for Single call SAO ?
How can we call methods in remoting Asynchronously ?
What is Asynchronous One-Way Calls ?
What is marshalling and what are different kinds of marshalling ?
What is ObjRef object in remoting ?
What is a WebService ?
What is UDDI ?
What is DISCO ?
What is WSDL?
What the different phase/steps of acquiring a proxy object in Webservice ?
What is file extension of Webservices ?
Which attribute is used in order that the method can be used as WebService ?
What are the steps to create a webservice and consume it ?
Do webservice have state ?

Caching Concepts

What is application object ?
What’s the difference between Cache object and application object ?
How can get access to cache object ?
What are dependencies in cache and types of dependencies ?
Can you show a simple code showing file dependency in cache ?
What is Cache Callback in Cache ?
What is scavenging ?
What are different types of caching using cache object of ASP.NET?
How can you cache different version of same page using ASP.NET cache object ?
How will implement Page Fragment Caching ?
What are ASP.NET session and compare ASP.NET session with classic ASP session
variables?
Which various modes of storing ASP.NET session ?
Is Session_End event supported in all session modes ?
What are the precautions you will take in order that StateServer Mode work properly ?
What are the precautions you will take in order that SQLSERVER Mode work properly ?
Where do you specify session state mode in ASP.NET ?
What are the other ways you can maintain state ?
What are benefits and Limitation of using Hidden fields ?
What is ViewState ?
Do performance vary for viewstate according to User controls ?
What are benefits and Limitation of using Viewstate for state management?
How an you use Hidden frames to cache client data ?
What are benefits and Limitation of using Hidden frames?
What are benefits and Limitation of using Cookies?
What is Query String and What are benefits and Limitation of using Query Strings?
OOPS
What is Object Oriented Programming ?
What’s a Class ?
What’s a Object ?
What’s the relation between Classes and Objects ?
What are different properties provided by Object-oriented systems ?
Twist :- Can you explain different properties of Object Oriented Systems?
Twist :- What’s difference between Association , Aggregation and Inheritance relationships?
How can we acheive inheritance in VB.NET ?
What are abstract classes ?
What’s a Interface ?
What is difference between abstract classes and interfaces?
What is a delegate ?
What are event’s ?
Do events have return type ?
Can event’s have access modifiers ?
Can we have shared events ?
What is shadowing ?
What’s difference between Shadowing and Overriding ?
What’s difference between delegate and events?
If we inherit a class do the private variables also get inherited ?
What are different accessibility levels defined in .NET ?
Can you prevent a class from overriding ?
What’s the use of “MustInherit” keyword in VB.NET ?
Why can not you specify accessibility modifier in Interface ?
What are similarities between Class and structure ?
What’s the difference between Class and structure’s ?
What does virtual keyword mean ?
What are shared (VB.NET)/Static(C#) variables?
What is Dispose method in .NET ?
Whats the use of “OverRides” and “Overridable” keywords ?
Where are all .NET Collection classes located ?
What is ArrayList ?
What’s a HashTable ?
Twist :- What’s difference between HashTable and ArrayList ?
What are queues and stacks ?
What is ENUM ?
What is nested Classes ?
What’s Operator Overloading in .NET?
In below sample code if we create a object of class2 which constructor will fire first ?
What’s the significance of Finalize method in .NET?
Why is it preferred to not use finalize for clean up?
How can we suppress a finalize method?
What’s the use of DISPOSE method?
How do I force the Dispose method to be called automatically, as clients can forget to call
Dispose method?
In what instances you will declare a constructor to be private?
Can we have different access modifiers on get/set methods of a property ?
If we write a goto or a return statement in try and catch block will the finally block
execute ?
What is Indexer ?
Can we have static indexer in C# ?
In a program there are multiple catch blocks so can it happen that two catch blocks are
executed ?
What is the difference between System.String and System.StringBuilder classes?

ASP.NET

What’s the sequence in which ASP.NET events are processed ?
In which event are the controls fully loaded ?
How can we identify that the Page is PostBack ?
How does ASP.NET maintain state in between subsequent request ?
What is event bubbling ?
How do we assign page specific attributes ?
Administrator wants to make a security check that no one has tampered with ViewState
, how can he ensure this ? 153
What’s the use of @ Register directives ?
What’s the use of SmartNavigation property ?
What is AppSetting Section in “Web.Config” file ?
Where is ViewState information stored ?
What’s the use of @ OutputCache directive in ASP.NET?
How can we create custom controls in ASP.NET ?
How many types of validation controls are provided by ASP.NET ?
Can you explain what is “AutoPostBack” feature in ASP.NET ?
How can you enable automatic paging in DataGrid ?
What’s the use of “GLOBAL.ASAX” file ?
What’s the difference between “Web.config” and “Machine.Config” ?
What’s a SESSION and APPLICATION object ?
What’s difference between Server.Transfer and response.Redirect ?
What’s difference between Authentication and authorization?
What is impersonation in ASP.NET ?
Can you explain in brief how the ASP.NET authentication process works?
What are the various ways of authentication techniques in ASP.NET?
How does authorization work in ASP.NET?
What’s difference between Datagrid , Datalist and repeater ?
From performance point of view how do they rate ?
What’s the method to customize columns in DataGrid?
How can we format data inside DataGrid?
How will decide the design consideration to take a Datagrid , datalist or repeater ?
Difference between ASP and ASP.NET?
What are major events in GLOBAL.ASAX file ?
What order they are triggered ?
Do session use cookies ?
How can we force all the validation control to run ?
How can we check if all the validation control are valid and proper ?
If you have client side validation is enabled in your Web page , Does that mean server
side code is not run?
Which JavaScript file is referenced for validating the validators at the client side ?
How to disable client side script in validators?
I want to show the entire validation error message in a message box on the client side?
You find that one of your validation is very complicated and does not fit in any of the
validators , so what will you do ?
What is Tracing in ASP.NET ?
How do we enable tracing ?
What exactly happens when ASPX page is requested from Browser?
How can we kill a user session ?
How do you upload a file in ASP.NET ?
How do I send email message from ASP.NET ?
What are different IIS isolation levels?
ASP used STA threading model , whats the threading model used for ASP.NET ?
Whats the use of <%@ page aspcompat=true %> attribute ?
Explain the differences between Server-side and Client-side code?
Can you explain Forms authentication in detail ?
How do I sign out in forms authentication ?
If cookies are not enabled at browser end does form Authentication work?
How to use a checkbox in a datagrid?
What are the steps to create a windows service in VB.NET ?
What’s the difference between “Web farms” and “Web garden”?
How do we configure “WebGarden”?
What is the main difference between Gridlayout and FlowLayout ?

.NET Architecture

What are design patterns ?
What’s difference between Factory and Abstract Factory Pattern’s?
What’s MVC pattern?
Twist: - How can you implement MVC pattern in ASP.NET?
How can we implement singleton pattern in .NET?
How do you implement prototype pattern in .NET?
Twist: - How to implement cloning in .NET ? , What is shallow copy and deep copy ?
What are the situations you will use a Web Service and Remoting in projects?
Can you give a practical implementation of FAÇADE patterns?
How can we implement observer pattern in .NET?
What is three tier architecture?
Have you ever worked with Microsoft Application Blocks, if yes then which?
What is Service Oriented architecture?
What are different ways you can pass data between tiers?
What is Windows DNA architecture?
What is aspect oriented programming?

ADO.NET

What is the namespace in which .NET has the data functionality classes ?
Can you give a overview of ADO.NET architecture ?
What are the two fundamental objects in ADO.NET ?
What is difference between dataset and datareader ?
What are major difference between classic ADO and ADO.NET ?
What is the use of connection object ?
What is the use of command objects and what are the methods provided by the command
object ?
What is the use of dataadapter ?
What are basic methods of Dataadapter ?
What is Dataset object?
What are the various objects in Dataset ?
How can we connect to Microsoft Access , Foxpro , Oracle etc ?
How do we connect to SQL SERVER , which namespace do we use ?
How do we use stored procedure in ADO.NET and how do we provide parameters to
the stored procedures?
How can we force the connection object to close after my datareader is closed ?
I want to force the datareader to return only schema of the datastore rather than data ?
How can we fine tune the command object when we are expecting a single row or a single
value ?
Which is the best place to store connectionstring in .NET projects ?
What are steps involved to fill a dataset ?
Twist :- How can we use dataadapter to fill a dataset ?
What are the various methods provided by the dataset object to generate XML?
How can we save all data from dataset ?
How can we check that some changes have been made to dataset since it was loaded ?
Twist :- How can we cancel all changes done in dataset ? , How do we get values which
are changed in a dataset ?
How can we add/remove row’s in “DataTable” object of “DataSet” ?
What’s basic use of “DataView” ?
What’s difference between “DataSet” and “DataReader” ?
Twist :- Why is DataSet slower than DataReader ?
How can we load multiple tables in a DataSet ?
How can we add relation’s between table in a DataSet ?
What’s the use of CommandBuilder ?
What’s difference between “Optimistic” and “Pessimistic” locking ?
How many way’s are there to implement locking in ADO.NET ?
How can we perform transactions in .NET?
What’s difference between Dataset. clone and Dataset. copy ?
Can you explain the difference between an ADO.NET Dataset and an ADO Recordset?
Explain in detail the fundamental of connection pooling?
What is Maximum Pool Size in ADO.NET Connection String?
How to enable and disable connection pooling?