// instance
public string InstancePr
{
get
return a;
}
set
a = value;
//read-only static
public static int ClassPr
return b;
Description : What si the difference between interface and abstractclass Select Answer: 1. interface contain only methods 2. we can't declare a variable for interface 3. interface contain only events 4. None 5. All
Last Answer : Ans : 2 The only Difference between Interface and Abstract class is we can declare a variable in abstract class but we can't declare in variable interface
Description : Can you declare an override method to be static if the original method is not static?
Last Answer : No. The signature of the virtual method must remain the same. (Note: Only the keyword virtual is changed to keyword override)
Description : What does the keyword “virtual” declare for a method or property?
Last Answer : The method or property can be overridden.
Description : When do you absolutely have to declare a class as abstract?
Last Answer : 1. When the class itself is inherited from an abstract class, but not all base abstract methods have been overridden. 2. When at least one of the methods in the class is abstract.
Description : How do you declare a constant?
Last Answer : public const int c1 = 5;
Description : Methods must declare a return type, what is the keyword used when nothing is returned from the method?
Last Answer : void
Description : When do you absolutely have to declare a class as abstract (as opposed to free-willed educated choice or decision based on UML diagram)?
Last Answer : When at least one of the methods in the class is abstract. When the class itself is inherited from an abstract class, but not all base abstract methods have been overridden.
Description : Can you declare the override method static while the original method is nonstatic?
Last Answer : No, you can’t, the signature of the virtual method must remain the same, only the keyword virtual is changed to keyword override.
Description : Can we declare a method as sealed?
Last Answer : In C# a method can’t be declared as sealed. However, when we override a method in a derived class, we can declare the overridden method as sealed. By declaring it as sealed, we can avoid further overriding of this method.
Description : Can we declare a block as static in c#?
Last Answer : No, because c# does not support static block, but it supports static method.
Description : Write some code that declares an array on ints, assigns the values: 0,1,2,5,7,8,11 to that array and use a foreach to do something with those values.
Last Answer : int x = 0, y = 0; int[] arr = new int [] {0,1,2}; foreach (int i in arr) { if (i%2 == 0) x++; else y++; }
Description : Write some code to use a delegate.
Last Answer : Member function with a parameter using System; namespace Console1 { class Class1 { delegate void myDelegate(int parameter1); static void Main(string[] args) { MyClass myInstance = new ... void AMethod(int param1) { Console.WriteLine(param1); } } }
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 : Write code to define and use your own custom attribute.
Last Answer : (From MSDN) // cs_attributes_retr.cs using System; [AttributeUsage(AttributeTargets.Class|AttributeTargets.Struct, AllowMultiple=true)] public class Author : Attribute { public Author(string name) { this.name ... double version; string name; public string GetName() { return name; } }
Description : Write some code to implement an indexer.
Last Answer : using System; namespace Console1 { class Class1 { static void Main(string[] args) { MyIndexableClass m = new MyIndexableClass(); Console.WriteLine(m[0]); Console.WriteLine(m[1]); Console.WriteLine(m[2]); Console. ... get { return myData[i]; } set { myData[i] = value; } } } }
Description : Write some code that uses an ArrayList.
Last Answer : ArrayList list = new ArrayList(); list.Add("Hello"); list.Add("World");
Description : Write some code to implement a jagged array.
Last Answer : // Declare the array of two elements: int[][] myArray = new int[2][]; // Initialize the elements: myArray[0] = new int[5] {1,3,5,7,9}; myArray[1] = new int[4] {2,4,6,8};
Description : Write some code to implement a multidimensional array.
Last Answer : int[,] b = {{0, 1}, {2, 3}, {4, 5}, {6, 7}, {8, 9}};
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 : Write some code for do… while.
Last Answer : int x; int y = 0; do { x = y++; Console.WriteLine(x); } while(y < 5);
Description : Write some code for a while loop.
Last Answer : int n = 1; while (n < 6) { Console.WriteLine("Current value of n is {0}", n); n++; }
Description : Write some code for a for loop
Last Answer : for (int i = 1; i <= 5; i++) Console.WriteLine(i);
Description : Write some if… else if… code.
Last Answer : int n=4; if (n==1) Console.WriteLine("n=1"); else if (n==2) Console.WriteLine("n=2"); else if (n==3) Console.WriteLine("n=3"); else Console.WriteLine("n>3");
Description : Write some try…catch…finally code.
Last Answer : // try-catch-finally using System; public class TCFClass { public static void Main () { try { throw new NullReferenceException(); } catch(NullReferenceException e) { Console.WriteLine("{0} exception 1 ... ("exception 2."); } finally { Console.WriteLine("finally block."); } } }
Description : Write some code to overload an operator.
Last Answer : class TempleCompare { public int templeCompareID; public int templeValue; public static bool operator == (TempleCompare x, TempleCompare y) { return (x.templeValue == y.templeValue); } ... templeValue); } public override int GetHashCode() { return templeCompareID; } }
Description : Write some code to box and unbox a value type.
Last Answer : // Boxing int i = 4; object o = i; // Unboxing i = (int) o;
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 : Write code for a case statement.
Last Answer : switch (n) { case 1: x=1; break; case 2: x=2; break; default: goto case 1; }
Description : Write code for an enumeration.
Last Answer : public enum animals {Dog=1,Cat,Bear};
Description : Write code to show how a method can accept a varying number of parameters.
Last Answer : using System; namespace Console1 { class Class1 { static void Main(string[] args) { ParamsMethod(1,"example"); ParamsMethod(1,2,3,4); Console.ReadLine(); } static void ... o in list) { Console.WriteLine(o.ToString()); } } } }
Description : Explain how properties differ from fields. Why would you expose public data through properties instead of fields?
Last Answer : Properties allow validation code to execute when values are accessed or changed. This allows you to impose some measure of control over when and how values are read or changed. Fields cannot perform validation when being read or set.
Description : Can an interface have properties?
Last Answer : Yes
Description : Can properties hide base class members of the same name?
Description : Can properties have an access modifier?
Description : Name a few string properties.
Last Answer : trim, tolower, toupper, concat, copy, insert, equals, compare.
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 Command is used to implement properties in C#?
Last Answer : get & set access modifiers are used to implement properties in c#.
Description : Describe how to use code to retrieve resources at run time.
Last Answer : You must first create an instance of the ResourceManager class that is associated with the assembly that contains the desired resource. You can then use the GetString method to retrieve string resources or the GetObject method to retrieve object resources.
Description : Briefly highlight the differences between imperative and declarative security as they pertain to code access security.
Last Answer : Imperative security is implemented by calling methods of Permission objects in code at run time. Declarative security is configured by attaching attributes representing permissions to classes ... request assembly-wide permissions using the Assembly (assembly) directive with declarative security.
Description : Explain how to convert data in legacy code page formats to the Unicode format.
Last Answer : You can use the Encoding.Convert method to convert data between encoding types. This method requires instances of both encoding types and an array of bytes that represents the data to be converted. ... GetBytes method and can convert an array of bytes back to chars with the Encoding.GetChars method.
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 is unsafe code?
Last Answer : Unsafe code bypasses type safety and memory management.
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 a code group?
Last Answer : A code group is a set of assemblies that share a security context.
Description : Write a C++ program to declare a class COLLEGE with members as college code. Derive a new class as STUDENT with members as studid. Accept and display details of student along with college for one object of student.
Last Answer : #include<iostream.h> #include<conio.h> class COLLEGE { protected: int collegecode; }; class STUDENT:public COLLEGE { int studid; public: void accept() { cout<<"Enter college ... STUDENT s; clrscr(); s.accept(); s.display(); getch(); }
Description : Write a C++ program to declare a class ‘College’ with data members as name and college code. Derive a new class ‘student’ from the class college with data members as sname and roll no. Accept and display details of one student with college data.
Last Answer : #include<iostream.h> #include<conio.h> class college { char name[10]; int collegecode; public: void getcollege() { cout<<"Enter college name:"; cin>>name; cout< ... (); s.getstudent(); s.putcollege(); s.putstudent(); getch(); }
Description : How would you read and write using the console?
Last Answer : Console.Write, Console.WriteLine, Console.Readline