This document contains 20 questions related to C# programming. The questions cover a variety of topics such as when to use structs vs classes, parsing XML files, checking if a number is a power of 2, getting the index of a foreach loop iteration, rounding decimals, removing duplicates from arrays, sorting dictionaries by value, and returning multiple values from a function.

2. #1: When to Use a struct vs
Class
#6: How would you count
the occurrences of a string
within a string?
#11: Encrypt/Decrypt a
String in .NET
#16: How do I Make a Texbox
that Only Accepts Numbers?
#2: How Does One Parse
XML Files?
#7: How to Check if a
Number is a Power of 2
#12: How do I Get the
Index of the Current
Iteration of a foreach
Loop?
#17: How do I Round a Decimal
Value to 2 Places for Output?
#3: What is the Difference
between String and string
#8: C# Loop – break vs
continue
#13: How to Get My Own
IP address in C#
#18: Remove Duplicates from
an Array
#4: How do I get the
Application’s Path in a C#
Console App?
#9: Difference Between
abstract and virtual
functions
#14: How do I Calculate
Someone’s Age in C#?
#19: How do I Sort a Dictionary
by Value?
#5: Calling base Constructor
in C#
#10: Difference Between ref
and out Keywords
#15: How do I get the
String Value of an enum?
#20: How Can I Return Multiple
Values From a Function in C#?

3. • structs are value types that can contain data and functions
• structs are value types and do not require heap allocation.
• structs directly store their data in the struct, classes store a reference to a dynamically allocated object.
• structs are useful for small data structures
• structs can affect performance
• Constructors are invoked with the new operator, but that does not allocate memory on the heap
• A struct constructor simply returns the struct value itself (typically in a temporary location on the stack),
and this value is then copied as necessary

4. • With classes, multiple variables may have a reference to the same object
• It is possible for operations on one variable to affect the object referenced by the other variable.
• With structs, the variables each have their own copy of the data, and it is not possible for operations on
one to affect the other.
• structs do not support user-specified inheritance, and they implicitly inherit from type object