Step by step migration of ASP.NET Core 2.2 to 3.1

In order to upgrade/migrate core version to 3.1 following steps to be perform.
Download and install Visual Studio 2019 version 16.4 or higher.Download and install .NET Core 3.1 the projects of solution to .NET Core 3.1 , because ASP.NET Core 3.1 requires it.Update existing Nuget packages to a version compatible with ASP.NET Core 3.1 in each projectUse IHost interface from a IHostBuilder instead of building and running a IWebHost from a IWebHostBuilder in Program.cs public static IHostBuilder CreateWebHostBuilder(string[] args) => Host.CreateDefaultBuilder(args) .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseKestrel() .UseSerilog() .UseStartup<Startup>(); }) Change AddMvc method has been replaced by AddControllers in Startup.cs of each projects.In Startup.cs,UseMvc method to be replaced by…

Prompt user before navigate away from current page where user typed some text using javascript

In your application suppose user putting the data, then user accidently click the outside link or clode button of browser. In this situation user may loose his entered data.

To avoid this we can propmt user about his unsaved data by using symple javascript code.

This code will prompt the user about unsaved data in current page.

following is the javascript code snippet 

<title>window.onbeforeunload example</title>
<script type="text/javascript">
var unsaved = false;

window.onbeforeunload = function() {
    if (unsaved) {
        return "You have unsaved data. Are you sure you wish to leave this page.";



<input type="text" id="input1" onkeydown="unsaved = true;"/>
<input type="submit" id="input1" onclick="unsaved = true;"/>

Try your self and let me know your comments


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