C# Interview Questions

It is C# basic interview question for beginners level.

1.       What is Class?

Ans: Collection of objects is called class. It is a logical entity.

A class can also be defined as a blueprint from which you can create an individual object. Class doesn't consume any space.

2.       Difference between Class and Objects?

Ans: Any entity that has state and behavior is known as an object. An Object can be defined as an instance of a class. An object contains an address and takes up some space in memory.

3.       What is Oops concept?

a.       What is inheritance?

Ans: When one object acquires all the properties and behaviors of a parent object, it is known as inheritance. It provides code reusability. It is used to achieve runtime polymorphism.

b.       What is Encapsulation?

Ans: Binding (or wrapping) code and data together into a single unit are known as encapsulation.

c.       What is Polymorphism?

Ans: If one task is performed by different ways, it is known as polymorphism.

d.       What is Abstract?

Ans: Hiding internal details and showing functionality is known as abstraction

Generate the Signed key for apache cordova

You can generate the sign key for your apache application by the given procedure.

1.       Open the command promt, it is windows command prompt.

2.       Get the  Keystore path

C:\Program Files\Java\jdk1.8.0_111\bin\keystore

Go to that above path in the command window.

3.       Give the Below command

keytool -genkey -v -keystore NAME-mobileapps.keystore -alias NAMEmobileapps -keyalg RSA -keysize 2048 -validity 10000

compilesdkversion 'android-26' requires jdk 1.8 or later to compile visual studio

You are getting the build error in the Android Apache Cordova.

>compilesdkversion 'android-26' requires jdk 1.8 or later to compile visual studio

You  are getting this error as your application is not pointing to the valid version of the  java SDK (JDK) 

You need to set the JAVA SDK version from below screen in visual Studio.

Tools > Option > Tools for Apache Cordova  > Environment Variable Override

failed to find target with hash string 'android-26' in: C:\ProgramData\Microsoft\AndroidSDK\25

You are getting the below issue, which is build error from android cordova application

* What went wrong:

> failed to find target with hash string 'android-26' in: C:\ProgramData\Microsoft\AndroidSDK\25

It is happening as you have not installed the particular image which your application is pointing to. You are missing the image where your android SDK is present as 

C:\ProgramData\Microsoft\AndroidSDK\25

You are having the android SDK version mentioned in Build.Gradle as like below.

ext {     apply from: 'cordova.gradle'     cdvCompileSdkVersion = 26 //privateHelpers.getProjectTarget()     cdvBuildToolsVersion = privateHelpers.findLatestInstalledBuildTools() }

Read PDF Table texts in Python

It will read the text from PDF in python.  Read Tables of PDF and place the data to XLSX file and read the XLSX file to one by one.

Suppose you are having the PDF file like below.

It’s a PDF file for Home loan, using the pdftables_api it will use to convert the PDF File into the form of xlsx file.

Now it will convert the PDF file into XSLX.