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VB.NET INTERVIEW QUESTION & ANSWERS

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61. What is the difference between boxing and unboxing?
  Boxing and unboxing act like bridges between value type and reference types. When we convert value type to a reference type it's termed as boxing. Unboxing is just like vice versa.
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62. What is reflection?
 
  • All .NET assemblies have metadata information stored about the types defined in modules. This metadata information can be accessed by mechanism called as Reflection.
  • System. Reflection can be used to browse through the metadata information.
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63. Is string a value type or a reference type?
  String is the reference type.
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64. Why is string called immutable data type?
  A string represents text and stores a sequential collection of characters in the memory. A string object is said to be immutable (read-only), because a value once assigned to a string object cannot be changed after the string object has been created. When the value in the string object is modified, a new string object is created with a new value assigned to the string object; therefore, keeping the old string in memory for garbage collector to be disposed.
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65. What is a session and application object?
 
  • Session object store information between HTTP requests for a particular user. Session variables are used to store user specific information where as in application variables we can't store user specific information.
  • while application object are global across users.
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