What is the use of virtual keyword in C#?

The virtual keyword is used to modify a method, property, indexer, or event declared in the base class and allow it to be overridden in the derived class. The override keyword is used to extend or modify a virtual/abstract method, property, indexer, or event of base class into derived class. 

Why abstraction is used in C#?

Abstraction allows making relevant information visible and encapsulation enables a programmer to implement the desired level of abstraction. Abstraction can be achieved using abstract classes in C#. C# allows you to create abstract classes that are used to provide a partial class implementation of an interface.

how to call web api method in client application c#

HttpClient class provides a base class for sending/receiving the HTTP requests/responses from a URL.

Example.

In this example, I have created a console application.

To call Web API methods from the console Application, the first step is to install the required packages, using the NuGet Package Manager.

Is it necessary to override a virtual method in C#?

C# virtual keyword is used to create virtual methods in C#. A virtual method is a method that can be redefined in derived classes. When a method is declared as a virtual method in a base class and that method has the same definition in a derived class then there is no need to override it in the derived class.a

error occurred while configuring nuget package manager

Goto Package console manager and download or restore 

And enable the NuGet console manager.

and build 

Why is abstraction needed?

Why abstraction is really important. A summary is one of the key elements of good software design. It helps to round out behavior. When developing with a high level of abstraction, you communicate behavior and execute less.

Change or remove windows saved passwords

1. Press Windows + R and type explorer shell:::{1206F5F1-0569-412C-8FEC-3204630DFB70} in the Run dialog box, hit Enter key to open Credential Manager snap-in.

2. Choose the credentials you want to remove and click on down arrow icon next to it.

3. Finally, click Remove.

This site can’t be reached error

Open a Command prompt and run these commands

           ipconfig /release
           ipconfig /all
           ipconfig /flushdns
           ipconfig /renew

How to search particular date records in sql sqerver

select * from tableName where CONVERT(varchar,[Timestamp],3) = '17/03/20' //here timestamp your table column name and data type datetime.

How do I create a SQL table under a different schema

how to create a schema and how to apply schema.
CREATE SCHEMA SchemaName;

or go to expand the database and goto security folder then expand and create the schema.
 it will create under the schema.

- here if we create any database it will create under dbo.
we want to create under our created schema
create a table and add primary key and auto-increment
then right-click on properties and change schema. that's it njoy...