c sharp Interview Questions
Tech Interview Questions site organizes over 1000 tech interview questions from multiple job functions. All these are in an easy question and answer format.
c sharp Interview Questions
1. Who is a protected class-level variable available to?
It is available to any sub-class (a class inheriting this class).
2. Are private class-level variables inherited?
Yes, but they are not accessible. Although they are not visible or accessible via the class interface, they are inherited.
3. Describe the accessibility modifier "protected internal".
It is available to classes that are within the same assembly and derived from the specified base class.
4. What's the top .NET class that everything is derived from?
System.Object
5. What does the term immutable mean?
The data value may not be changed. Note: The variable value may be changed, but the original immutable data value was discarded and a new data value was created in memory.
6. What's the difference between System.String and System.Text.StringBuilder classes?
System.String is immutable. System.StringBuilder was designed with the purpose of having a mutable string where a variety of operations can be performed.
7. How can you sort the elements of the array in descending order?
By calling Sort() and then Reverse() methods
8. 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.
9. Can you store multiple data types in System.Array?
No
10. Whats 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 identacle object.
1. Who is a protected class-level variable available to?
It is available to any sub-class (a class inheriting this class).
Yes, but they are not accessible. Although they are not visible or accessible via the class interface, they are inherited.
It is available to classes that are within the same assembly and derived from the specified base class.
4. What's the top .NET class that everything is derived from?
System.Object
The data value may not be changed. Note: The variable value may be changed, but the original immutable data value was discarded and a new data value was created in memory.
System.String is immutable. System.StringBuilder was designed with the purpose of having a mutable string where a variety of operations can be performed.
7. How can you sort the elements of the array in descending order?
By calling Sort() and then Reverse() methods
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.
No
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 identacle object.
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