Description : Explain the “static” keyword in C#?
Last Answer : “Static” keyword can be used for declaring a static member. If the class is made static then all the members of the class are also made static. If the variable is made static then it will have a single instance and the value change is updated in this instance.
Description : Define what are the difference between const and readonly?
Last Answer : A const cannot be static, while readonly can be static. A const need to be declared and initialized at declaration only, while a readonly can be initialized at the declaration or by the code in the ... A const's value is evaluated at design time, while a read-only value is evaluated at runtime.
Description : Define what is the difference between CONST and READONLY?
Last Answer : Both are meant for constant values. A const field can only be initialized at the declaration of the field. A read-only field can be initialized either at the declaration or.
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 : Write code to use threading and the lock keyword.
Last Answer : using System; using System.Threading; namespace ConsoleApplication4 { class Class1 { [STAThread] static void Main(string[] args) { ThreadClass tc1 = new ThreadClass(1); ThreadClass tc2 = new ThreadClass( ... Console.WriteLine(threadNumber + " working"); Thread.Sleep(1000); } } } } }
Description : What keyword would you use for scope name clashes?
Last Answer : this
Description : Define what is the use of the abstract keyword?
Last Answer : The modifier abstract is a keyword used with a class, to indicate that this class cannot itself have direct instances or objects, and it is intended to be only a ‘base’ class to other classes.
Description : What does the keyword “virtual” declare for a method or property?
Last Answer : The method or property can be overridden.
Description : What is the volatile keyword used for?
Last Answer : It indicates a field can be modified by an external entity (thread, OS, etc.).
Description : Class methods to should be marked with what keyword?
Last Answer : static
Description : Methods must declare a return type, what is the keyword used when nothing is returned from the method?
Last Answer : void
Description : What does the keyword virtual mean in the method definition?
Last Answer : The method can be over-ridden.
Description : Why is the virtual keyword used in code?
Last Answer : The Virtual keyword is used in code to define methods and the properties that can be overridden in derived classes.
Description : Define what is the difference between string keyword and System. String class?
Last Answer : String keyword is an alias for System. String class. Therefore, the System. String and string keyword are the same, and you can use whichever naming convention you prefer. The String class provides many methods for safely creating, manipulating, and comparing strings.
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 : Define what is the main use of delegates in C#?
Last Answer : Delegates are mainly used to define call back methods.
Description : Can we use “this” inside a static method in C#?
Last Answer : No. We can’t use “this” in a static method.
Description : Why use “finally” block in C#?
Last Answer : Finally block will be executed irrespective of exception. So while executing the code in try block when an exception occurs, control is returned to catch block and at last finally block will be ... the closing connection to database / releasing the file handlers can be kept in finally block.
Description : Why use “using” in C#?
Last Answer : “Using” statement calls – “dispose of” method internally, whenever any exception occurred in any method call and in “Using” statement objects are read-only and cannot be reassignable or modifiable.
Description : Can you change the value of a variable while debugging a C# application?
Last Answer : Yes. If you are debugging via Visual Studio.NET, just go to Immediate window.
Description : How do you generate documentation from the C# file commented properly with a command-line compiler?
Last Answer : Compile it with the /doc switch.
Description : What is the syntax to inherit from a class in C#?
Last Answer : Place a colon and then the name of the base class. Example: class MyNewClass : MyBaseClass
Description : What’s the C# syntax to catch any possible exception?
Last Answer : A catch block that catches the exception of type System.Exception. You can also omit the parameter data type in this case and just write catch {}.
Description : Does C# support multiple-inheritance?
Last Answer : No.
Description : List the differences in C# 2.0.
Last Answer : • Generics • Iterators • Partial class definitions • Nullable Types • Anonymous methods • :: operator • Static classes static class members • Extern keyword • Accessor accessibility • Covariance and Contravariance • Fixed size buffers • Fixed assemblies • #pragma warning
Description : What mechanisms does C# have for the readers, writers problem?
Last Answer : System.Threading.ReaderWriterLock which has methods AcquireReaderLock, ReleaseReaderLock, AcquireWriterLock, and ReleaseWriterLock
Description : Does C# have “friendship”?
Last Answer : Not before C# 2.0
Description : Does C# supports multiple inheritance?
Last Answer : No
Description : Can C# have multiple catch blocks?
Last Answer : Yes
Description : Can C# have global overflow checking?
Description : Name 10 C# keywords.
Last Answer : abstract, event, new, struct, explicit, null, base, extern, object, this
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 : Isn't C# just a copy of Java?
Last Answer : In some ways, yes. The semantics of the CLR are quite Java-esque, and so any CLR-based language will have a good deal in common with Java. Creating a language that expresses those semantics in a syntax ... had been free to make some changes to Java, my guess is that C# wouldn't exist today.
Description : Which is better: C# or Java?
Last Answer : The two languages have an awful lot in common, and so in some ways it's natural to try to choose a winner. The fact that each language is often viewed as the flagship of its camp-C# in Microsoft's . ... like the radio. You can do it, but you'll be happier if you choose based on the whole package.
Description : C# provides a default constructor for me. I write a constructor that takes a string as a parameter, but want to keep the no parameter one. How many constructors should I write?
Last Answer : Two. Once you write at least one constructor, C# cancels the freebie constructor, and now you have to write one yourself, even if there’s no implementation in it.
Description : Does C# support multiple inheritance?
Last Answer : No, use interfaces instead.
Description : How do you inherit from a class in C#?
Last Answer : Place a colon and then the name of the base class.
Description : Define what are the advantages of getting and set properties in C#?
Last Answer : 1. The get property accessor is used to return the property value. 2. The set property accessor is used to assign a new value.
Description : Define what are sealed classes in c#?
Last Answer : The sealed modifier is used to prevent derivation from a class. A compile-time error occurs if a sealed class is specified as the base class of another class.
Description : Define what is a basic difference between the while loop and do-while loop in C#?
Last Answer : The while loop tests its condition at the beginning, which means that the enclosed set of statements run for zero or more number of times if the condition evaluates to true. The do while loop iterates a set of statements at least once and then checks the condition at the end.
Description : Define what is the syntax to inherit from a class in C#?
Last Answer : When a class is derived from another class, then the members of the base class become the members of the derived class. The access modifier used while accessing members of the base class specifies ... syntax to inherit a class from another class In C# is as follows: class MyNewClass : MyBaseClass
Description : Define what Command is used to implement properties in C#?
Last Answer : get & set access modifiers are used to implement properties in c#.