60. What’s the advantage of using System.Text.StringBuilder over System.String?
StringBuilder is more efficient in cases where there is a large amount of string manipulation. Strings are immutable, so each time a string is changed, a new instance in memory is created.
61. Can you store multiple data types in System.Array?
No.
62. What is the smallest unit of execution in .NET?
An Assembly is the smallest unit of execution in .NET.
63. What’s the difference between the System.Array.CopyTo () and System.Array.Clone ()?
The Clone () method returns a new array (a shallow copy) object containing all the elements in the original array. The CopyTo () method copies the elements into another existing array. Both perform a shallow copy. A shallow copy means the contents (each array element) contains references to the same object as the elements in the original array. A deep copy (which neither of these methods performs) would create a new instance of each element's object, resulting in a different, yet identical object.
64. How can you sort the elements of the array in descending order?
By calling Sort () and then Reverse () methods.
65. What’s the .NET collection class that allows an element to be accessed using a unique key?
HashTable.
66. What class is underneath the SortedList class?
A sorted HashTable.
67. Will the finally block get executed if an exception has not occurred?
Yes.
68. What’s the C# syntax to catch any possible exception?
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 {}.
69. Can multiple catch blocks be executed for a single try statement?
No. Once the proper catch block processed, control is transferred to the finally block (if there are any).
70. Does the .NET Framework have in-built support for serialization?
There are two separate mechanisms provided by the .NET class library
1. XmlSerializer (for Web Services)and
2.SoapFormatter/BinaryFormatter.( for remoting.)
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