Thursday, November 17, 2005

. Net Interview Questions - Part III

1. What is .NET Framework?
Ans. The .NET Framework has two main components: the common language runtime and the .NET Framework class library. You can think of the runtime as an agent that manages code at execution time, providing core services such as memory management, thread management, and remoting, while also enforcing strict type safety and other forms of code accuracy that ensure security and robustness. The class library, is a comprehensive, object-oriented collection of reusable types that you can use to develop applications ranging from traditional command-line or graphical user interface (GUI) applications to applications based on the latest innovations provided by ASP.NET, such as Web Forms and XML Web services.

2. What is CLR?
Ans. The .NET Framework provides a runtime environment called the Common Language Runtime or CLR (similar to the Java Virtual Machine or JVM in Java), which handles the execution of code and provides useful services for the implementation of the program. CLR takes care of code management at program execution and provides various beneficial services such as memory management, thread management, security management, code verification, compilation, and other system services. The managed code that targets CLR benefits from useful features such as cross-language integration, cross-language exception handling, versioning, enhanced security, deployment support, and debugging.

3. What is CTS?
Ans. Common Type System (CTS) describes how types are declared, used and managed in the runtime and facilitates cross-language integration, type safety, and high performance code execution.

4. What is CLS?
Ans. The CLS is simply a specification that defines the rules to support language integration in such a way that programs written in any language, yet can interoperate with one another, taking full advantage of inheritance, polymorphism, exceptions, and other features.

5. Is .NET a runtime service or a development platform?
Ans. It's both and actually a lot more. Microsoft .NET includes a new way of delivering software and services to businesses and consumers. A part of Microsoft.NET is the .NET Frameworks. The .NET frameworks SDK consists of two parts: the .NET common language runtime and the .NET class library. In addition, the SDK also includes command-line compilers for C#, C++, JScript, and VB. You use these compilers to build applications and components. These components require the runtime to execute so this is a development platform.

6. What is MSIL, IL?
Ans. When compiling to managed code, the compiler translates your source code into Microsoft intermediate language (MSIL), which is a CPU-independent set of instructions that can be efficiently converted to native code. MSIL includes instructions for loading, storing, initializing, and calling methods on objects, as well as instructions for arithmetic and logical operations, control flow, direct memory access, exception handling, and other operations. Microsoft intermediate language (MSIL) is a language used as the output of a number of compilers and as the input to a just-in-time (JIT) compiler. The common language runtime includes a JIT compiler for converting MSIL to native code.

7. What is JIT (just in time)? how it works?
Ans. Before Microsoft intermediate language (MSIL) can be executed, it must be converted by a .NET Framework just-in-time (JIT) compiler to native code, which is CPU-specific code that runs on the same computer architecture as the JIT compiler. Rather than using time and memory to convert all the MSIL in a portable executable (PE) file to native code, it converts the MSIL as it is needed during execution and stores the resulting native code so that it is accessible for subsequent calls. The runtime supplies another mode of compilation called install-time code generation. The install-time code generation mode converts MSIL to native code just as the regular JIT compiler does, but it converts larger units of code at a time, storing the resulting native code for use when the assembly is subsequently loaded and executed. As part of compiling MSIL to native code, code must pass a verification process unless an administrator has established a security policy that allows code to bypass verification. Verification examines MSIL and metadata to find out whether the code can be determined to be type safe, which means that it is known to access only the memory locations it is authorized to access.
8. What is strong name?
Ans. A name that consists of an assembly's identity, its simple text name, version number, and culture information (if provided) strengthened by a public key and a digital signature generated over the assembly.

9. What is portable executable (PE)?
Ans. The file format defining the structure that all executable files (EXE) and Dynamic Link Libraries (DLL) must use to allow them to be loaded and executed by Windows. PE is derived from the Microsoft Common Object File Format (COFF). The EXE and DLL files created using the .NET Framework obey the PE/COFF formats and also add additional header and data sections to the files that are only used by the CLR.
10. What is Code Access Security (CAS)?
Ans. CAS is the part of the .NET security model that determines whether or not a piece of code is allowed to run, and what resources it can use when it is running. For example, it is CAS that will prevent a .NET web applet from formatting your hard disk.
11. How does CAS work?
Ans. The CAS security policy revolves around two key concepts - code groups and permissions. Each .NET assembly is a member of a particular code group, and each code group is granted the permissions specified in a named permission set. For example, using the default security policy, a control downloaded from a web site belongs to the 'Zone - Internet' code group, which adheres to the permissions defined by the 'Internet' named permission set. (Naturally the 'Internet' named permission set represents a very restrictive range of permissions.)
12. Who defines the CAS code groups?
Ans. Microsoft defines some default ones, but you can modify these and even create your own.
13. Which namespace is the base class for .net Class library?
Ans: system.object.
14. What is Application Domain?
The primary purpose of the AppDomain is to isolate an application from other applications. Win32 processes provide isolation by having distinct memory address spaces. This is effective, but it is expensive and doesn't scale well. The .NET runtime enforces AppDomain isolation by keeping control over the use of memory - all memory in the AppDomain is managed by the .NET runtime, so the runtime can ensure that AppDomains do not access each other's memory. Objects in different application domains communicate either by transporting copies of objects across application domain boundaries, or by using a proxy to exchange messages.

15. What is MarshalByRefObject object?
Ans. MarshalByRefObject is the base class for objects that communicate across application domain boundaries by exchanging messages using a proxy. Objects that do not inherit from MarshalByRefObject are implicitly marshal by value. When a remote application references a marshal by value object, a copy of the object is passed across application domain boundaries.
16. What is Serialization/Deserialization in .NET?
Ans. Serialization is the process of converting an object into a stream of bytes. Deserialization is the opposite process of creating an object from a stream of bytes. Serialization/Deserialization is mostly used to transport objects (e.g. during remoting), or to persist objects (e.g. to a file or database).Serialization can be defined as the process of storing the state of an object to a storage medium. During this process, the public and private fields of the object and the name of the class, including the assembly containing the class, are converted to a stream of bytes, which is then written to a data stream. When the object is subsequently deserialized, an exact clone of the original object is created.
17. What are the ways to control serialization?
Ans. Following are the waysto control Serialization:
· Binary serialization preserves type fidelity, which is useful for preserving the state of an object between different invocations of an application. For example, you can share an object between different applications by serializing it to the clipboard. You can serialize an object to a stream, disk, memory, over the network, and so forth. Remoting uses serialization to pass objects "by value" from one computer or application domain to another.
· XML serialization serializes only public properties and fields and does not preserve type fidelity. This is useful when you want to provide or consume data without restricting the application that uses the data. Because XML is an open standard, it is an attractive choice for sharing data across the Web. SOAP is an open standard, which makes it an attractive choice.


ASP.Net Interview Questions

1. You are a Web developer for Techno Inc. You create an ASP.NET application that accesses sales and marketing data. The data is stored in a Microsoft SQL Server 2000 database on a server named TestK01. The company purchases a factory automation software application. The application is installed on TestK01, where it creates a second instance of SQL Server 2000 named Factory and a database named FactoryDB. You connect to FactoryDB by using Windows Integrated authentication.
You want to add a page to your ASP.NET application to display inventory data from FactoryDB. You use a SqlConnection object to connect to the database. You need to create a connection string to FactoryDB in the instance of SQL Server named Factory on TestK01. Which string should you use?

Ans. "Data Source= TestK01\Factory;Database=FactoryDB; Integrated Security=SSP1"
The Data Source attribute of the connection string contains the name, instance or network address of the instance of SQL Server to which to connect. In this scenario we are to connect to the Factory Instance on TestK01 so we use TestK01\Factory as data source. To specify the database we should either use the Database or the Initial Catalog attribute. Here we use Database=FactoryDB.
2. You are creating an ASP.NET application for Techno Inc's Internet Web site. You want to create a toolbar that will be displayed at the top of each page in the Web site. The toolbar will contain only static HTML code. The toolbar will be used in only your application. You plan to create the toolbar as a reusable component for your application. You need to create the toolbar as quickly as possible. What should you do?
Ans. Add a new Web user control to your ASP.NET project. Create the toolbar within the Web user control. Web user controls enable you to easily define controls as you need them for your applications, using the same programming techniques that you use to write Web Forms pages.
3. You ASP.NET application manage order entry data by using a DataSet object named TKorderEntry. The TKorderEntry object includes two DataTable objects named orderNames and OrderDetails. A ForeignKeyConstraint object named orderDetailsKey is defined between the two DataTable objects. You attempt to delete a row in orderNames while there are related rows in OrderDetails, and an exception is generated. What is the most likely cause of the problem?
Ans. The current value of OrderDetails.KeyDeleteRule is Rule.None. The rule enumeration indicates the action that occurs when a ForeignKeyConstraint is enforced. None specifies that no action will occur, but exceptions are generated. This is what has occurred in this scenario.
4. You are creating an ASP.NET application to track sales orders for Techno Inc Ltd. The application users an ADO.NET DataSet object that contains two DataTable objects. One table is named Orders, and the other table is named OrderDetails. The application displays data from the Orders table in a list box. You want the order details for an order to be displayed in a grid when a user selects the order in the list box. You want to modify these objects to enable your code to find all the order details for the selected order. What should you do?

Ans. Add a DataRelation object to the Relations collection of the DataSet object. In order to enable the DataGrid to display from multiple tables we need to relate the tables with DataRelation.
5. You create an ASP.NET application to display a sorted list of products in a DataGrid control. The product data is stored in a Microsoft SQL Server database named Techno Inc Products. Each product is identified by a numerical value named ProductID, and each product has an alphabetic description named ProductName. You write ADO.NET code that uses a SqlDataAdapter object and a SqlCommand object to retrieve the product data from the database by calling a stored procedure. You set the CommandType property of the SqlCommand object to CommandType.StoredProcedure. You set the CommandText property of the object to procProductList. Your code successfully fills a DataTable object with a list of products that is sorted by ProductID in descending order. You want to data to be displayed in reverse alphabetic order by ProductName. What should you do?
Ans. Create a new DataView object based on the DataTable object. Set the Sort Property of the DataView object to "ProductName DESC". Bind the DataGrid control to the DataView object. We can create a DataView object, set the appropriate Sort Property and bind the DataGrid control to the DataView, and not the DataTable object.
6. You create an ASP.NET application and deploy it on a test server named Techno IncSrv. The application consists of a main page that links to 30 other pages containing ASP.NET code. You want to accomplish the following goals:• Ena tracing on all the pages in the application except the main page. • Display trace output for up to 40 requests. • Ensure that trace output is appended to the bottom of each of the pages that will contain trace output. • Ensure that any configuration changes affect only this application. You need to accomplish these goals with the minimum amount of development effort. Which three actions should you take?
Ans. The Following three Actions can be taken:
· Add the following element to the Web.config file: . You can enable tracing for an entire application in the web.config file in the application's root directory. We should use the trace element and set the enabled attribute to true.
· Add the following attribute to the Trace element of the application’s Web.config file: requestLimit=40. We should also set the RequestLimit attribute of TraceElement, the number of trace requests to store on the server, to 40, since the default value is 10.
· Set the Trace attribute of the Page directive to false for the main page. When you enable tracing for an entire application in the web.config file (A), trace information is gathered and processed for each page in that application. To disable tracing for a particular page in the application, set the Trace attribute in that page's @ Page directive to false.
7. You are creating an ASP.NET page for Techno Inc. The page uses string concatenation to gather data from multiple e-mail messages and format the data for display on the page. You want to ensure that the page displays as quickly as possible. What should you do?
Ans. Write code that uses the Append method of the StringBuilder object. The StringBuilder.Append method appends the string representation of a specified object to the end of this instance.The StringBuilder class represents a string-like object whose value is a mutable sequence of characters. The value is said to be mutable because it can be modified once it has been created by appending, removing, replacing, or inserting characters.
8. You are creating an ASP.NET application that uses the Microsoft SQL Server .NET Data Provider to connect to Techno Inc’s database. Your database administrator reports that, due to heavy usage of the application, data requests are being blocked while users wait for new connections to be created. You want to improve throughput by setting a minimum connection pool size of 10. What should you do?
Ans. Add a Min Pool Size property to the connection string you use when opening a connection, and specify a minimum size of 10 for the connection pool. The Min Pool Size property of the connection string denotes the minimum number of connections maintained in the pool

9. You create an ASP.NET application named TKProject on your client computer. The application has a page named ProjectCalendar.aspx. This page is located in a virtual directory named Scheduling, which is a child of the TKProject root directory. ProjectCalendar.aspx uses cookies to track modifications to the schedule during a user’s session so that the user can undo modifications if necessary. You deploy your application on a computer named Techno Inc1. Users report that the undo functionality stops working after they execute a specific sequence of actions. You need to view the cookie values after the sequence of actions to help identify the cause of the problem. You add the following element to the Web.config file:

You want to display the trace output information on your client computer. What URL should you use?

Ans. HTTP://Techno1/TKProject/ProjectCalendar.aspx?trace.axd.
Trace.axd is an Http Handler that we can use to request application trace details. To use trace.axd, simply request trace.axd in the same application directory, not the virtual directoy, that the request for the sample application was made. The output provided by tracing view, either through Trace.axd or on a page, provides six sections of detail.
Cookies collection - Any cookies that the client sends in the request headers are parsed, and their names, values, and sizes are displayed.Request details. - Trace information. Control tree. - Headers collection. - Server variables
10. You are creating an ASP.NET application for your company Techno Inc. Techno Inc data is stored in a Microsoft SQL Server 6.5 database. Your application generates accounting summary reports based on transaction tables that contain million of rows. You want your application to return each summary report as quickly as possible. You need to configure your application to connect to the database and retrieve the data in a way that achieves this goal. What should you do?
Ans. Use an OleDbConnection object to connect to the database, and use an OleDbCommand object to run a stored procedure that returns the data. We need to use an OleDBConnection to connect to SQL Server Version 6.5 (or earlier).

1. Does C# support multiple inheritance?
No, use interfaces instead

2. What’s the implicit name of the parameter that gets passed into the class’ set method?
Value, and its datatype depends on whatever variable we’re changing

3. What’s the top .NET class that everything is derived from?
System.Object.

4. How’s method overriding different from overloading?
When overriding, you change the method behavior for a derived class. Overloading simply involves having a method with the same name within the class.

5. What is CLR?
The .NET Framework provides a runtime environment called the Common Language Runtime or CLR (similar to the Java Virtual Machine or JVM in Java), which handles the execution of code and provides useful services for the implementation of the program. CLR takes care of code management at program execution and provides various beneficial services such as memory management, thread management, security management, code verification, compilation, and other system services. The managed code that targets CLR benefits from useful features such as cross-language integration, cross-language exception handling, versioning, enhanced security, deployment support, and debugging.

6. What is CTS?
Common Type System (CTS) describes how types are declared, used and managed in the runtime and facilitates cross-language integration, type safety, and high performance code execution.

7. What is CLS?
The CLS is simply a specification that defines the rules to support language integration in such a way that programs written in any language, yet can interoperate with one another, taking full advantage of inheritance, polymorphism, exceptions, and other features. These rules and the specification are documented in the ECMA proposed standard document, "Partition I Architecture", http://msdn.microsoft.com/net/ecma

8. What is strong name?
A name that consists of an assembly's identity—its simple text name, version number, and culture information (if provided)—strengthened by a public key and a digital signature generated over the assembly.

9. What is Application Domain?
The primary purpose of the AppDomain is to isolate an application from other applications. Win32 processes provide isolation by having distinct memory address spaces. This is effective, but it is expensive and doesn't scale well. The .NET runtime enforces AppDomain isolation by keeping control over the use of memory - all memory in the AppDomain is managed by the .NET runtime, so the runtime can ensure that AppDomains do not access each other's memory. Objects in different application domains communicate either by transporting copies of objects across application domain boundaries, or by using a proxy to exchange messages.

10. What is serialization in .NET? What are the ways to control serialization?
Serialization is the process of converting an object into a stream of bytes. Deserialization is the opposite process of creating an object from a stream of bytes. Serialization/Deserialization is mostly used to transport objects (e.g. during remoting), or to persist objects (e.g. to a file or database).Serialization can be defined as the process of storing the state of an object to a storage medium. During this process, the public and private fields of the object and the name of the class, including the assembly containing the class, are converted to a stream of bytes, which is then written to a data stream. When the object is subsequently deserialized, an exact clone of the original object is created. Binary serialization preserves type fidelity, which is useful for preserving the state of an object between different invocations of an application. For example, you can share an object between different applications by serializing it to the clipboard. You can serialize an object to a stream, disk, memory, over the network, and so forth. Remoting uses serialization to pass objects "by value" from one computer or application domain to another. XML serialization serializes only public properties and fields and does not preserve type fidelity. This is useful when you want to provide or consume data without restricting the application that uses the data. Because XML is an open standard, it is an attractive choice for sharing data across the Web. SOAP is an open standard, which makes it an attractive choice. There are two separate mechanisms provided by the .NET class library - XmlSerializer and SoapFormatter/BinaryFormatter. Microsoft uses XmlSerializer for Web Services, and uses SoapFormatter/BinaryFormatter for remoting. Both are available for use in your own code.

11. What are Satellite Assemblies?
Satellite assemblies are often used to deploy language-specific resources for an application. These language-specific assemblies work in side-by-side execution because the application has a separate product ID for each language and installs satellite assemblies in a language-specific subdirectory for each language. When uninstalling, the application removes only the satellite assemblies associated with a given language and .NET Framework version. No core .NET Framework files are removed unless the last language for that .NET Framework version is being removed.

12. What is Global Assembly Cache (GAC) and what is the purpose of it?
Each computer where the common language runtime is installed has a machine-wide code cache called the global assembly cache. The global assembly cache stores assemblies specifically designated to be shared by several applications on the computer. You should share assemblies by installing them into the global assembly cache only when you need to.

13. What is Reflection in .NET?
All .NET compilers produce metadata about the types defined in the modules they produce. This metadata is packaged along with the module (modules in turn are packaged together in assemblies), and can be accessed by a mechanism called reflection. The System.Reflection namespace contains classes that can be used to interrogate the types for a module/assembly.

14. What is the managed and unmanaged code in .net?
The .NET Framework provides a run-time environment called the Common Language Runtime, which manages the execution of code and provides services that make the development process easier. Compilers and tools expose the runtime's functionality and enable you to write code that benefits from this managed execution environment. Code that you develop with a language compiler that targets the runtime is called managed code; it benefits from features such as cross-language integration, cross-language exception handling, enhanced security, versioning and deployment support, a simplified model for component interaction, and debugging and profiling services

15. What are Namespaces?
The namespace keyword is used to declare a scope. This namespace scope lets you organize code and gives you a way to create globally-unique types. Even if you do not explicitly declare one, a default namespace is created. This unnamed namespace, sometimes called the global namespace, is present in every file. Any identifier in the global namespace is available for use in a named namespace. Namespaces implicitly have public access and this is not modifiable.

16. What are the access-specifiers available in c#?
Private, Protected, Public, Internal, Protected Internal.

17. Advantage of ADO.Net?
· ADO.NET Does Not Depend On Continuously Live Connections · Database Interactions Are Performed Using Data Commands · Data Can Be Cached in Datasets · Datasets Are Independent of Data Sources · Data Is Persisted as XML · Schemas Define Data Structures

18. Difference between OLEDB Provider and SqlClient ?
SQLClient .NET classes are highly optimized for the .net / sqlserver combination and achieve optimal results. The SqlClient data provider is fast. It's faster than the Oracle provider, and faster than accessing database via the OleDb layer. It's faster because it accesses the native library (which automatically gives you better performance), and it was written with lots of help from the SQL Server team.

19. Differences between dataset.clone and dataset.copy?
Clone - Copies the structure of the DataSet, including all DataTable schemas, relations, and constraints.Does not copy any data Copy - Copies both the structure and data for this DataSet.

20. In a Webservice, need to display 10 rows from a table. So DataReader or DataSet is best choice?
WebService will support only DataSet.

21. What is Remoting?
The process of communication between different operating system processes, regardless of whether they are on the same computer. The .NET remoting system is an architecture designed to simplify communication between objects living in different application domains, whether on the same computer or not, and between different contexts, whether in the same application domain or not.

22. What’s the difference between System.String and System.StringBuilder classes?
System.String is immutable; System.StringBuilder was designed with the purpose of having a mutable string where a variety of operations can be performed.

23. What’s a delegate?
A delegate object encapsulates a reference to a method. In C++ they were referred to as function pointers.

24. What’s an interface class?
It’s an abstract class with public abstract methods all of which must be implemented in the inherited classes

25. What is the transport protocol you use to call a Web service




Microsoft ASP.NET interview questions
These questions are asked by Microsoft at one of their international locations.
1. What is an interface and what is an abstract class? Please, expand by examples of using both. Explain why.
2. What is serialization, how it works in .NET?
3. What should one do to make class serializable?
4. What exactly is being serialized when you perform serialization?
5. Tell me about 6h4 methods you have used to perform serialization.
6. Did you work with XML and XSL Transformations?
7. What methods and what for did you use to work with XML?
8. What is the purpose of reserved word “using” in C#?
9. How does output caching work in ASP.NET?
10. What is connection pooling and how do you make your application use it?
11. What are different methods of session maintenance in ASP.NET?
12. What is Viewstate?
13. Can any object be stored in a Viewstate?
14. What should you do to store an object in a Viewstate?
15. Explain how Viewstate is being formed and how it’s stored on client.
16. Explain control life cycle, mind event order.
17. What do you know about ADO.NET’s objects and methods?
18. Explain DataSet.AcceptChanges and DataAdapter.Update methods.
19. Assume you want to update a record in the database using ADO.NET. What necessary steps you should perform to accomplish this?
20. How to retreive the value of last identity has been updated in a database (SQL Server)?

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