What’s the .NET collection class that allows an element to be accessed using a unique key? 

1 Answer

Answer :

HashTable. 

Related questions

Description : What’s the .NET collection class that allows an element to be accessed using a unique key?

Last Answer : HashTable.

Description : Write some code for a custom collection class.

Last Answer : using System; using System.Collections; public class Items : IEnumerable { private string[] contents; public Items(string[] contents) { this.contents = contents; } public IEnumerator GetEnumerator() { ... (string item in items) { Console.WriteLine(item); } Console.ReadLine(); } }

Description : What’s the top .NET class that everything is derived from?

Last Answer : System.Object.

Description : What’s the top .NET class that everything is derived from? 

Last Answer : System.Object.

Description : What’s the top .NET class that everything is derived from?

Last Answer : System.Object.

Description : How do you enable your application to use .NET base class library members without referencing their fully qualified names?

Last Answer : Use the Imports keyword (Visual Basic .NET) or the using keyword (Visual C#) to make a .NET Framework namespace visible to your application. 

Description : What is the role of the DataReader class in ADO.NET connections?

Last Answer : It returns a read-only, forward-only rowset from the data source. A DataReader provides fast access when a forward-only sequential read is needed.

Description : What is the role of the DataReader class in ADO.NET connections?

Last Answer : It returns a read-only, forward-only rowset from the data source. A DataReader provides fast access when a forward-only sequential read is needed. 

Description : ______ involves traversing the entire file system, marking everything that can be accessed. (1) Index pointer (2) Garbage collection (3) File system (4) Stack pointer

Last Answer : Garbage collection

Description : Briefly describe how garbage collection works.

Last Answer : The garbage collector is a thread that runs in the background of managed .NET applications. It constantly traces the reference tree and attempts to find objects that are no longer referenced. When a nonreferenced object is found, its memory is reclaimed for later use.

Description : Describe garbage collection (in simple terms).

Last Answer : Garbage collection eliminates uneeded objects. 1. the new statement allocates memory for an object on the heap. 2. When no objects reference the object it may be removed from the heap (this is a non deterministic process). 3. Finalize is called just before the memory is released.

Description : What memory technology allows two memory modules to be accessed at the same time?

Last Answer : What is the answer ?

Description : Write some code using interfaces, virtual methods, and an abstract class.

Last Answer : using System; public interface Iexample1 { int MyMethod1(); } public interface Iexample2 { int MyMethod2(); } public abstract class ABSExample : Iexample1, Iexample2 { public ABSExample( ... override void VIRTMethod2() { System.Console.WriteLine("VIRTMethod2 has been overridden"); } }

Description : Give an example of using a sealed class in C#?

Last Answer : Below is the sample code of sealed class in C# - class X {} sealed class Y : X {} Sealed methods - class A { protected virtual void First() { } protected virtual void Second() { } } ... inherits from class B then method - First will not be overridable as this method is sealed in class B.

Description : Which one of the following tools is used to view the metadata information contained in a .NET assembly? Select Answer:  1. al.exe  2. ilasm.exe  3. vbx.exe  4. csc.exe  5. ildasm.exe

Last Answer :  5. ildasm.exe

Description : In Visual Basic .NET or Visual C# programming, when would you use Structured Query Language (SQL)? How are they executed? 

Last Answer : ADO.NET handles most of the database communication for you behind-thescenes. You would only use SQL statements when generating ad-hoc queries for the database. You execute SQL statements by ... returning statements, such as DELETE, INSERT INTO, or UPDATE statements, use the ExecuteNonQuery method.

Description : How could you execute DDL commands, such as ALTER or CREATE TABLE, against a database with ADO.NET?

Last Answer : You must use a Command object to execute DDL commands. You can set the CommandType property to Text and enter the appropriate DDL command in the CommandText property. Then call Command.ExecuteNonQuery to execute the command.

Description : Briefly contrast connected and disconnected data access in ADO.NET.

Last Answer : In ADO.NET, connected data access is available through the DataReader, which is a lightweight class designed to provide very fast and efficient data access. It is severely limited, however, in ... to update the database and keeping the connection open just long enough to execute those commands.

Description : Briefly describe the major components of the .NET Framework and describe what each component does.

Last Answer : The .NET Framework consists of two primary parts: the common language runtime, which manages application execution, enforces type safety, and manages memory reclamation, and the .NET base class library, which consists of thousands of predeveloped classes that can be used to build applications.

Description : Option statements that are supported in VB.NET?

Last Answer : Option Explicit:- By default, Option Explicit is on for VB.NET projects. It's a good programming practice to set Option Explicit on because it helps developers avoid implicitly declaring variables, and thus write ... . It's also a safer way to develop code, which is why most developers prefer it. 

Description : What do you know about .NET assemblies?

Last Answer : Answer: Assemblies are the smallest units of versioning and deployment in the .NET application. Assemblies are also the building blocks for programs such as Web services, Windows services, serviced components, and .NET remoting applications.

Description : What is purpose of Assembly Linker or define SDK Tool in .NET Framework?

Last Answer : Answer: In .NET whole the working should be with the helps of DLLs.So all of Visual Studio .Net compilers gernate assemblies or u can say dll.If we want to create an assembly with ... Studio .Net .This multi file can contain modules that are written in diffrenet langauage in one application.

Description : What size is a .NET object?

Last Answer : Each instance of a reference type has two fields maintained by the runtime - a method table pointer and a sync block. These are 4 bytes each on a 32-bit system, making a total of 8 bytes ... bytes, even for classes with no data (e.g. System.Object). Values types have no equivalent overhead. 

Description : When should you call the garbage collector in .NET?

Last Answer : As a good rule, you should not call the garbage collector. However, you could call the garbage collector when you are done using a large object (or set of objects) to force the garbage collector to dispose of those very large objects from memory. However, this is usually not a good practice. 

Description : What is the smallest unit of execution in .NET?

Last Answer : an Assembly. 

Description : How is the DLL Hell problem solved in .NET? 

Last Answer : Assembly versioning allows the application to specify not only the library it needs to run (which was available under Win32), but also the version of the assembly.

Description : What are advantages and disadvantages of Microsoft-provided data provider classes in ADO.NET?

Last Answer : SQLServer.NET data provider is high-speed and robust, but requires SQL Server license purchased from Microsoft. OLE-DB.NET is universal for accessing other sources, like Oracle, DB2, Microsoft Access and Informix. ... on top of the OLE layer, so it's not as fastest and efficient as SqlServer.NET.

Description : How do you debug an ASP.NET Web application?

Last Answer : Attach the aspnet_wp.exe process to the DbgClr debugger. 

Description : What debugging tools come with the .NET SDK?

Last Answer : 1. CorDBG – command-line debugger. To use CorDbg, you must compile the original C# file using the /debug switch. 2. DbgCLR – graphic debugger. Visual Studio .NET uses the DbgCLR.

Description : When should you call the garbage collector in .NET?

Last Answer : As a good rule, you should not call the garbage collector. However, you could call the garbage collector when you are done using a large object (or set of objects) to force the garbage collector to dispose of those very large objects from memory. However, this is usually not a good practice.

Description : What is the smallest unit of execution in .NET?

Last Answer : an Assembly. 

Description : How is the DLL Hell problem solved in .NET? 

Last Answer : Assembly versioning allows the application to specify not only the library it needs to run (which was available under Win32), but also the version of the assembly. 

Description : What are advantages and disadvantages of Microsoft-provided data provider classes in ADO.NET?

Last Answer : SQLServer.NET data provider is high-speed and robust, but requires SQL Server license purchased from Microsoft. OLE-DB.NET is universal for accessing other sources, like Oracle, DB2, Microsoft Access and Informix. ... on top of the OLE layer, so it's not as fastest and efficient as SqlServer.NET.

Description : How do you debug an ASP.NET Web application?

Last Answer : Attach the aspnet_wp.exe process to the DbgClr debugger.

Description : What debugging tools come with the .NET SDK?

Last Answer : 1. CorDBG – command-line debugger. To use CorDbg, you must compile the original C# file using the /debug switch.   2. DbgCLR – graphic debugger. Visual Studio .NET uses the DbgCLR.

Description : Will we eventually see a .NET Framework-based version of Java as a competitor to C#?

Last Answer : Apparently not. Microsoft will never offer a complete Java environment because Sun has essentially required that Java licensees implement all of Java-something Microsoft will never do. (Why should it? Does ... she's working in a true Java environment because the familiar libraries won't be there. 

Description : But won't most .NET developers eventually choose C# over Visual Basic.NET? 

Last Answer : No. Because the power of the two languages is so similar, the primary factor for developers migrating to the .NET world will probably be the syntax they prefer. Since many more developers ... the dominant language for building Windows applications five years from now will still be Visual Basic. 

Description : Isn't C# the native language of .NET?

Last Answer : Every language built on the .NET Framework must use the CLR. The CLR defines core language semantics, and so all of the languages built on it tend to have a great deal in common. The biggest choice a . ... just a little bit more-and so neither is the "native" .NET language. There is no such thing.

Description : In 8279, the keyboard entries are debounced and stored in an _________, that is further accessed by the CPU to read the key codes. a) 8-bit FIFO b) 8-byte FIFO c) 16 byte FIFO d) 16 bit FIFO

Last Answer : b) 8-byte FIFO

Description : Describe how to retrieve the ASCII key code from a keystroke. How would you retrieve key combinations for non-ASCII keys?

Last Answer : Keystrokes can be intercepted by handling the KeyPress and KeyDown events. Both of these events relay information to their handling methods in the form of their EventArgs. The KeyPressEventArgs, ... you would handle the KeyDown event and use the properties exposed by the KeyEventArgs instance.

Description : What’s the difference between the Debug class and Trace class? 

Last Answer : Documentation looks the same. Use Debug class for debug builds, use Trace class for both debug and release builds.

Description : What’s the implicit name of the parameter that gets passed into the set method/property of a class?

Last Answer : Value. The data type of the value parameter is defined by whatever data type the property is declared as.

Description : What’s the difference between an interface and abstract class?

Last Answer : Answer: An abstract class and Interface both have method only but not have body of method.The difference between Abstract class and An Interface is that if u call Ablstract class then u have to call ... type, Parameter type, Parameter Number all must be same . Only body of method can change. 

Description : What’s an abstract class?

Last Answer : Answer:Classes that cannot be instantiated. We cannot create an object from such a class for use in our program. We can use an abstract class as a base class, creating new classes that will inherit from ... can inherit from a non-abstract class. In C++, this concept is known as pure virtual method.

Description : What’s the difference between the Debug class and Trace class? 

Last Answer : Documentation looks the same. Use Debug class for debug builds, use Trace class for both debug and release builds.

Description : What’s the implicit name of the parameter that gets passed into the set method/property of a class?

Last Answer : Value. The data type of the value parameter is defined by whatever data type the property is declared as.

Description : What’s an abstract class?

Last Answer : A class that cannot be instantiated. An abstract class is a class that must be inherited and have the methods overridden. An abstract class is essentially a blueprint for a class without any implementation.

Description : What’s an interface class? 

Last Answer : It’s an abstract class with public abstract methods all of which must be implemented in the inherited classes.

Description : What’s an abstract class? 

Last Answer : A class that cannot be instantiated. A concept in C++ known as pure virtual method. A class that must be inherited and have the methods over-ridden. Essentially, it’s a blueprint for a class without any implementation.

Description : What’s the implicit name of the parameter that gets passed into the class’ set method?

Last Answer : Value, and it’s datatype depends on whatever variable we’re changing.