First Top 5 Interview Questions in CSHARP for the year - 2023 - USMTECHWORLD.

1. What is C#?

Answer:
It is an object oriented programming which runs on dotnet framework or dotnet core.This code will run on windows,mac,android.The standard editor will be visual studio starting from version 2010 to 2022.The code can be used in both windows applications and web applications.It is used to build API,Mobile,Web.

2. What are the different types of loops in C#?

Answer:

While
Do While
For
Foreach

But mostly we will be using for and foreach loop.

3. What are the different types of collections in C#?

Answer:

Array
Jagged Arrays
List
DataTable
Hashtable

But mostly we will be using List.

4. What are the design patterns in C#?

Answer:
Design patterns provide general solutions for common problems.The most common design patterns are:-

Factory
Repository
Singleton
Proxy
Template

5. Whether it is possible to store different datatypes in an array in C#?

Answer:
Yes, in object array we can store different datatypes.For eg:-

int[] samparr=new int[];
samparr[0]=1;
samparr[1]=2;
samparr[2]="str";// we cannot store string in integer array

This can be solved by declaring object array like the below


        object[] objarr=new object[];
objarr[0]="str";
objarr[1]=1;

Also we can store complex type inside this object array. let us create an instance of an object and try to store inside this object array.


        sales objsales=new sales();
objsales.salesid=1;
objsales.salesperson="Muruga";
objarr[2]=objsales;