Jun 12

Basic C# Interview Questions and Answers

41.What are value types and reference types?

Value types are stored in the Stack.
Examples : bool, byte, chat, decimal, double, enum , float, int, long, sbyte, short, strut, uint, ulong, ushort.

Reference types are stored in the Heap.
Examples : class, delegate, interface, object, string.

42. What is the difference between string keyword and System.String class?

String keyword is an alias for Syste.String class. Therefore, 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.

43. What are the two data types available in C#?

  1. Value type
  2. Reference type

44. What are the different types of Caching?

There are three types of Caching:

  1. Output Caching: stores the responses from an asp.net page.
  2. Fragment Caching: Only caches/stores the portion of page (User Control)
  3. Data Caching: is Programmatic way to Cache objects for performance.

45. What is the difference between Custom Control and User Control?

Custom Controls are compiled code (Dlls), easier to use, difficult to create, and can be placed in toolbox. Drag and Drop controls.

Attributes can be set visually at design time. Can be used by Multiple Applications (If Shared Dlls), Even if Private can copy to bin directory of web application add reference and use. Normally designed to provide common functionality independent of consuming Application.

User Controls are similar to those of ASP include files, easy to create, can not be placed in the toolbox and dragged – dropped from it. A User Control is shared among the single application files.

46. What is methods?

A method is a member that implements a computation or action that can be performed by an object or class. Static methods are accessed through the class. Instance methods are accessed through instances of the class.

47. What is field?

A field is a variable that is associated with a class or with an instance of a class.

48. What is an event?

An event is a member that enables a class or object to provide notifications. An event is declared like a field except that the declaration includes an event keyword and the type must be a delegate type.

49. What is literals and their types?

Literals are value constants assigned to variables in a program. C# supports several types of literals are

  • Integer literals
  • Real literals
  • Boolean literals
  • Single character literals
  • String literals
  • Backslash character literals

50. What is the difference between value type and reference type?

Value types are stored on the stack and when a value of a variable is assigned to another variable.

Reference types are stored on the heap, and when an assignment between two reference variables occurs.

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