Tutorials on ASP.NET Core and MVC

This tutorial explains the Startup class in ASP.NET, along with the methods of this class. We also explain how a custom middleware can be attached b . . .

This tutorial explains everything necessary to get you started with the middleware in ASPNET Core. We explain the built-in middleware components as . . .

Use the concepts learnt till now, and without using razor, and without mvc framework, create a contact form that has a text box (cusName) and a date . . .

This is a summary of the concepts of routing and route templates in asp.net core. We have taken a practical exercise to develop the concepts in an i . . .

Write an ASP.NET Core application such that the route "/home/index/N", where N is any int number, executes only if the website is hosted o . . .

Some, not all, routes need a daily downtime between 17 hrs to 18 hrs. So they have to be shut during that period so that no requests are processed. . . .

How to POST an ASP.NET Core Razor FORM through an Ajax Request. We discuss a practical approach that is to-the-point and easy to understand. The giv . . .

The following project has a textbox with a send button. The click event fires an AJAX GET request and sends a string parameter to an ASP.NET Core ap . . .

In nutshell: The selection change event of the master dropdown is used to send the "id" of the selected item to the server, which sends ba . . .

This project is about creating an Admin Panel that would be suitable for a reporting project or an EBook that shows a table of links on the left and . . .

In brief: Just two additions are required to implement AJAX based authorization in your existing ASP.NET Core application - first is on the javascri . . .

Pure Javascipt and html5 based general solution for in-place or in-line editing of the tr, td records of an html table. This solution is suitable fo . . .

Simplest explanation of AJAX based Edit, Update, Cancel operations on a row of an HTML table. An ASP.NET Core POST handler receives the updated valu . . .

Anti-forgery token is NOT available outside of <form> tags. This article, alongwith the appended video, explains how to use IAntiforgery serv . . .

This is a step by step video course for learning ASP.NET Core. Learn from the comfort of your home. Each topic is explained in a beginner's lang . . .

Looking for the "protected" App_Data folder in ASP.NET Core? The news is that it doesn't have that status anymore. It is no longer a & . . .

This is the simplest example of reading and updating a record. For simplicity, the record consists of just one property called Name. An input textbo . . .

This is a walkthrough on how to make calls to an XML database via repository pattern and dependency injection. We also give a brief introduction to . . .

Here is a to-the-point tutorial on how database connectivity works in ASP.NET Core. A 3-step roadmap is laid for running your first query to a datab . . .

A form of only one input textbox is POSTed and the data is inserted into a sqlite database. This is a six step walkthrough that starts from creating . . .

We start this walkthrough with a small introduction to the concept of a cookie, and then we explain the various ASP.NET Core snippets to (a) create . . .

This is a walkthrough on how to obtain user consent for usage of cookies on an asp.net core website. This project uses the ITrackingConsentFeature i . . .

_ViewImports.cshtml is shared by all the razor pages in its peer directory, and in the sub-directories below it. It is like an include file, and it . . .

This is a comprehensive discussion on the need for "areas", and how to practically create "areas", and how, un-like classic MVC, . . .

Razor components are stand-alone, embeddable units that replace themselves with pure HTML, CSS and JS markup. They can accept parameters from the ho . . .

So this article starts by explaining the various aspects of a partial view from a practical, day-to-day perspective. We have totally removed those p . . .

This article explains behind-the-scenes mechanism by which "Session" is implemented in ASP.NET Core. We also enumerate the four extension . . .

This tutorial continues from where we left the tutorial on INSERT query (see the link below for a recap). The code we discussed there has been exten . . .

There is no built-in method for storing DateTime into a session variable in ASP.NET Core. However, the Microsoft MSDN docs suggest that developers c . . .

We start by explaining the general scheme for deleting a record from a table. A foreach loop adds an anchor link to each record. The primary key (id . . .

This tutorial discusses the most desired scenario where data entry form and the already existing records are shown on the same page. Each record has . . .

TempData can be used to pass data from one razor page to another. Although QueryString and Session variables can be used to achieve the same objecti . . .

This tutorial extends the one-textbox FORM that we have implemented for CRUD operations in the previous tutorial (see link below). Now we add a chec . . .

This tutorial extends the FORM that we have implemented in the previous tutorial (see link below). Now we add a radiobuttonlist to that form and obs . . .

This tutorial extends the FORM that we have implemented in the previous tutorial (see link below). Now we add a dropdownlist to that form and observ . . .

This is the simplest introduction to Razor Pages - why you need them, what they are, and how page events and data could be handled with them. See th . . .

This is a quick and complete explanation of how to integrate your razor pages to a framework such as bootstrap, and how to add and manage your cust . . .

Tag helpers provide a standard way of generating html tags in razor pages. They are interpreted on server side. They are of the same syntax as html . . .

An anchor tag helper can be used to specify the name of the click event handler. For this the attribute "asp-page-handler" is set equal to . . .

This is an introduction to the most common UI Elements that can be used on a FORM. The article starts with a quick introduction to an html form of o . . .

A form submit is triggerred by a submit button inside FORM tags. If the method is POST, which is most often the case, then the recommended handler i . . .

This article starts with a brief primer on server side validations and why they should be done. A simple model of just one property is used to expla . . .

SaveChanges can fail if a constraint fails, if a connection error occurs or if any generic error occurs. So it should always be wrapped in a try-cat . . .

This is a brief explanation of how to specify single primary key on a model through attributes - but this approach fails when multiple columns are t . . .

This is an explanation of how an "Area" based ASP.NET Core project can be configured for role and policy based authorization. Authorizatio . . .

This article starts with an explanation of "SignIn", and then explains the various steps for a signin process. Finally, we discuss what is . . .

This is a snippet on showing "You are logged as ..." on every page that an authenticated and authorized user visits. The code can be inser . . .

Following is a brief scheme on signing out a logged-in user. A function for sign-out is written in the same file as for the login code. Then this fu . . .

This is a quick and clean scheme for uploading files to a server. In the first part we demonstrate how to store them into a database table. And, in . . .

A file can be downloaded by returning a FileResult. This article explains how a FileResult is created. Finally, a walkthrough is given that shows a . . .

This is an explanation of SingleOrDefault, FirstOrDefault and Find methods from a practical point of view. We have explained when to use which one a . . .

This is an explanation of Where, Include and the ToList methods from a practical point of view. We have explained when to use which one and how to u . . .

EF Core translates your LINQ expressions into SQL language queries. However, sometimes it is easier, convenient and faster (as determined by testing . . .

A result set can be sorted in ascending as well as descending order. It is even possible to perform a chained sorting by using "ThenBy" an . . .

(LEVEL IS BEGINNERS) Following is a collection of exercises and practice questions that help in cementing the concepts of asp.net core razor pages. . . .

(LEVEL IS BEGINNERS) These are practice questions and exercises on Basic Event Handling in Razor Pages. Solve them and join our course for their sol . . .

(LEVEL IS BEGINNERS) These are practice questions and exercises on Basic database connectivity in Razor Pages. Solve them and join our course for th . . .

(LEVEL IS BEGINNERS) These are practice questions and exercises on Modularity in Razor Pages. Solve them and join our course for their solutions.

Following are the minimal steps needed to run a hello world type of razor component that handles a click event. The component will have to be based . . .

These are the minimal steps for connecting to a MySQL database server with EF Core. A simple application of one textbox form has been used to demons . . .

(LEVEL IS BEGINNERS) These are practice questions and exercises on Areas and Partial Views in Razor Pages. Solve them and join our course for their . . .

These are the minimal steps for connecting to a Microsoft SQL Server database with EF Core. A simple application of one textbox form has been used t . . .

This article is a beginner's introduction to the terminology associated with docker files, docker images and containers. I have kept the explana . . .

This is a walkthrough on creating a docker image with visual studio. We start by creating a simple asp.net core project with sqlite database connect . . .

This is a walkthrough on running a docker image. We start by explaining the commands for listing the docker images on a computer. Then we explain th . . .

In the previous tutorial we were able to run an image in a docker container. The docker container provided a RW memory for our project and also for . . .

This is a walkthrough on uploading a docker image to the docker hub registry. We shall upload the same hellodocker project and then verify the uploa . . .

In this tutorial we shall learn how to pull and run the docker image of Microsoft SQL Server through the Docker Desktop program. In this same tutori . . .

In this tutorial we shall learn how to connect an ASP.NET Core application to a SQL Server image that is running inside a docker container. Some dat . . .

In this tutorial we shall first create a docker image of our "Find a Docker" project. After that we shall publish that image to the Docker . . .

In this tutorial we shall learn an introduction to the database migrations. This feature is provided by entity framework core through its command li . . .

We shall start by creating a simple asp.net core project. Then we shall add nuget packages for a database such as Microsoft SQL Server. After that w . . .

In the previous tutorial we added the EF Core migration tools to our project. We shall now run our first migration to create a blank database and it . . .

A real life project evolves over a period of time. This process necessitates additions and alterations to the model classes - properties are added, . . .

In this tutorial we learn that the recommended strategy for migrations is to migrate through SQL Scripts. We will also learn how to use ef core tool . . .

This tutorial explains about the various environments like Development, Staging and Production. We also explain how to set them by various methods a . . .

An ASP.NET Core application cannot directly accept requests from the internet. For this it needs a server that can face the internet and help it com . . .

We learn about the finer details of launchSettings.json file. This file contains various launch profiles to start an application in various modes - . . .

Logging helps in troubleshooting, it helps in audit, it helps in getting signals of an imminent application crash. This topic explains the terminolo . . .

We shall create an app using visual studio 2022, running .NET 6. The application will artificially throw an un-handled exception. Then we shall veri . . .

This tutorial continues our previous tutorial where we learnt that if an application is running under development environment, then ASP.NET Core pro . . .

We have seen in the previous tutorials that appSettings json file can be used to configure log levels. But this is not the only use of this file - i . . .

In the previous tutorial we read various properties of an appSettings configuration file. But there is a better method for reading complex propertie . . .

We shall create an identity based project from scratch. Although, visual studio provides a scaffolding for all the various modules, but personally I . . .

This tutorial shall continue from the previous tutorial where we have made a basic initialization, and we have also created a database to hold the d . . .

The problem with the built-in registration page provided by ASP.NET Core Identity API is that it contains a lot of tags and bootstrap attributes tha . . .

Recall from the previous tutorial that in our program.cs file we have set SignIn.RequireConfirmedAccount = true. This prevents immediate login to a . . .

As soon as a new user registers on a website, an account verification email or an sms is immediately sent to him. But it is possible that a user nev . . .

Very often a user is unable to remember the password that he created for a website. In such circumstances, the forgot password link comes to his res . . .

We have seen in the previous tutorial that when a user fills the forgot password form, then he is emailed a link to the reset password page. The lin . . .

In its simplest terms, a claim is a name-value pair used to verify authorization. For example, you may be authorized to access a page if a claim of . . .

It is a good idea to show the user name of a logged user in the header of each page of a website. And, if the user is not logged in, then the login . . .

A sign out link allows a logged user to log out of your website. It is usually shown in the header of a page and close to the name of the logged in . . .

You must have seen on various websites that a user account gets locked if the user makes about three unsuccessful login attempts. The exact same fun . . .

Two factor authentication gives additional security to a login process. But this type of authentication has to be specifically enabled by a user. Fo . . .

Consider a user who has enabled 2-factor authentication as explained in the previous tutorial. Such a user is required to authenticate twice before . . .

The purpose of this tutorial is to add the functionality that allows a user to disable his 2-factor authentication. For this we shall have to modify . . .

This tutorial starts with a beginner's introduction to the concept of web api. After that we create a basic structure of a project that will hel . . .

In this tutorial we shall add a web api that allows us to get all the records of a table. Please do note, however, that such a query is never done i . . .

In the previous tutorial we learned how to write a web api that accepts no parameters. We executed it to return all the records of a table. In this . . .

In this tutorial we shall add a web api of GET type that takes an ID as a parameter and returns a record for that parameter.

Postman is a software that can be used to easily and conveniently run and execute web api. It can be installed as a desktop application. The softwar . . .

A web api of the POST type is used to create a new record. For example, if we have to create a new record of a doctor, then we have to use a POST ap . . .

An Http PUT request is used to update an existing record. For this, a client has to send the unique id of the record along with the entire updated r . . .

An HTTP DELETE request is used for deleting a record. The Server sends a 200 OK response on successful deletion alongwith the item that was deleted. . . .

We have been working with a model class consisting of three properties - id, Name and Fees. All the three properties have participated and have been . . .

If an API has to return a collection of records, and if we do not want entire objects transmitted, then we can use a Data Transfer Object to return . . .

This tutorial explains how to modify a POST type of WebApi so that it doesn't over-post data. A POST WebApi receives a data object as a paramete . . .

This tutorial explains how a GET web api can be called from a C++ WinRT application. I have chosen WinRT type because it contains a lot many pre-wri . . .

This tutorial explains how a POST web api can be called from a C++ WinRT application. I have created a WinRT console application that connects to, . . .

Swagger makes it easy to document the various Web Api exposed by your project. The summary of your API is maintained in a json based file called ope . . .

Let us now configure our WebApi project to add support for SwaggerUI. As we told earlier, SwaggerUI is provided by both SwashBuckle and NSwag. We ca . . .

In this tutorial we shall learn how to call the various types of WebApi from a C# WPF application. I have already created a WPF application that obt . . .

This tutorial continues from the previous tutorial. We have discussed most of the parts there. So please go through the previous tutorial for a cont . . .

As you must have already seen in the previous tutorials, we have a WPF application that obtains a list of records from our ASPNET Core web api appli . . .

Http Repl is a command-line tool for testing web api. This tool targets the ASP.NET Core environment. Let's have a look at a brief introduction . . .

Before we can execute and test any web api, we have to establish a connection between httprepl and our web server. If you are following this chapter . . .

Now its time to use httprepl for testing our web api. To begin with, we shall test a GET api. I shall assume that your httprepl is installed and rea . . .

In this tutorial we shall test a POST Web Api - and create a new record. So we shall have to first establish a connection between httprepl and our w . . .

So far, we have been writing all our minimal web api in the program.cs file. But this can become un-manageable and un-readable in a full blown proje . . .

We have been obtaining our web api parameters from route templates. A route is not the only source of parameters - in fact the parameters can be obt . . .

Parameters of a web api can be obtained from the values in a request header also. For this an attribute called "FromHeader" is used to dec . . .

ASP.NET Core provides certain "special" parameters that are always available to an api handler. These parameters are "utility" p . . .

Consider a web api that extracts parameters x, y and z from its query string and then uses these values to construct a Point object, say for example . . .

BindAsync is a second method for custom binding of parameters. The first one - TryParse - is good for cases where the items are available in a singl . . .

In this tutorial we examine how to write a web api that accepts an uploaded file and saves it to a server. We shall also present a C# console applic . . .

Basic Authentication is not encourged by ASP.NET Core because login id and password are sent as plain text in the request header - it's vulnerab . . .

The recommended way of implementing a custom authentication scheme is by deriving a class from AuthenticationHandler and implementing the HandleAuth . . .

JWT stands for JSON Web Token. In its simplest form, JWT authentication is a two step process. First a client obtains a JWT token from the server. T . . .

In this tutorial we present a C# console application that connects to the web api that we have done in the previous tutorial. This app will first ob . . .

Social media based authentication requires us to create an oauth app on a social media platform such as google, facebook, twitter, github. This app . . .

Social media based login provides a neat and user-friendly means of logging into your website. Users are more likely to trust this method because of . . .

WebApi can be protected through social media authentication also. The first step is to obtain a client id and a client secret by creating an app on . . .

We shall run two ASPNET Core apps concurrently - the first exposes a web API, whereas the other shows a web page containing two links - the first of . . .

In the previous tutorial, we demonstrated how a browser blocks cross-origin calls. So you must surely be wondering why cross-origin requests to CDN- . . .

An ASPNET Core application can permit cross-origin requests by adding "Access-Control-Allow-Origin" header to the HTTP response. Cross-ori . . .

Static files are NOT accessible cross-origin if we call UseStaticFiles before UseCors. But if we reverse the order, every static file becomes access . . .

Browsers consider some cross-origin requests as unsafe. For example, an HTTP PUT request is considered unsafe. A browser first queries the server if . . .

In this tutorial, we learn how to set a CORS policy that will respond to a pre-flight OPTIONS request. This policy will specify the list of acceptab . . .

By default, a browser doesn't send authentication cookies with cross-origin requests. It sends cookies only if the javascript code sets a proper . . .

In this tutorial, we have two applications - the first is an ASPNET Core application that implements a CORS policy to accept cookies from the second . . .

In this tutorial we shall set a project to use SQL Server as our database. You can obtain this project from the downloads attached to this video. Bu . . .

EF Core provides logs that help us determine the time taken by a specific query to finish. The logs also display the actual SQL query that was execu . . .

We shall use various methods to calulate the sum of prices of all the records in the items table. We will also take note of the times taken. Usually . . .

Lazy loading is a great O/RM pattern that AUTOMATICALLY loads dependent (child) data when it is first accessed. The delayed loading is both an advan . . .

A query can first store the entire resultset into memory, and then use a foreach loop to process each item. Alternatively, it can stream each result . . .

Suppose your database team have already provided you an optimized query in SQL syntax. Or let's say you have a legacy, old setup that makes it c . . .

Raw SQL queries and Stored Procedures can be executed with the FromSqlRaw extension. It is very common that these queries and procedures require par . . .

EF Core uses batching to execute bulk updates in a single trip to the database. You can always fine-tune your code by carefully sequencing your stat . . .

This is the simplest example of reading and updating a record. For simplicity, the record consists of just one property called Name. An input textbo . . .