Difference between value and reference type. what are value types and
Value type - bool, byte, chat, decimal, double, enum , float, int, long,
sbyte, short, strut, uint, ulong, ushort
Value types are stored in the Stack
Reference type - class, delegate, interface, object, string
Reference types are stored in the Heap
What are the two kinds of
Two types of properties in .Net: Get and Set
Constructor is a method in the class which has the same name as the
class (in VB.Net its New()). It initializes the member attributes
whenever an instance of the class is created.
Describe ways of cleaning up objects.
There is a perfect tool provide by .net frameworks calls Garbage
collector, where by mean of GC we can clean up the object and reclaim
the memory. The namespace used is System.GC
the run time will maintain a service called as garbage collector. This
service will take care of deallocating memory corresponding to
objects. it works as a thread with least priority. when application
demands for memory the runtime will take care of setting the high
priority for the garbage collector, so that it will be called for
execution and memory will be released. the programmer can make a call to
garbage collector by using GC class in system name space.
How can you clean up objects holding resources from within the code?
Call the dispose method from code for clean up of objects
Which controls do not have events?
What is the maximum size of the textbox?
Which property of the textbox cannot be changed at runtime?
Which control cannot be placed in MDI?
The controls that do not have events.
What is the difference between proc. sent BY VAL and BY SUB?
BY VAL: changes will not be reflected back to the variable.
By REF: changes will be reflected back to that variable.( same as &
symbol in c, c++)
General C# Interview Questions :
Does C# support multiple-inheritance?
Who is a protected class-level variable available to?
It is available to any sub-class (a class inheriting this class).
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.
Describe the accessibility modifier “protected internal”.
It is available to classes that are within the same assembly and derived
from the specified base class.
What’s the top .NET class that everything is derived from?
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.
What’s the difference between System.String and
System.String is immutable. System.StringBuilder was designed with the
purpose of having a mutable string where a variety of operations can be
What’s the advantage of using System.Text.StringBuilder over
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.
Can you store multiple data types in System.Array?
What’s the difference between the System.Array.CopyTo() and
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
How can you sort the elements of the array in descending order?
By calling Sort() and then Reverse() methods.
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